Increased human-animal interface & emerging zoonotic diseases: An enigma requiring multi-sectoral efforts to address

Falguni Debnath; Debjit Chakraborty; Alok Kumar Deb; Malay Kumar Saha; Shanta Dutta

doi:10.4103/ijmr.IJMR_2971_20

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Review Article

153 (

5-6

); 577-584

doi:

10.4103/ijmr.IJMR_2971_20

Increased human-animal interface & emerging zoonotic diseases: An enigma requiring multi-sectoral efforts to address

Falguni Debnath¹, Debjit Chakraborty^1,, Alok Kumar Deb¹, Malay Kumar Saha², Shanta Dutta^3,†

1Division of Epidemiology, ICMR-National Institute of Cholera & Enteric Diseases, Kolkata, West Bengal, India

2Division of Virology, ICMR-National Institute of Cholera & Enteric Diseases, Kolkata, West Bengal, India

3Division of Bacteriology, Kolkata, West Bengal, India

†ICMR-National Institute of Cholera & Enteric Diseases, Kolkata, West Bengal, India

For correspondence: Dr Debjit Chakraborty, Division of Epidemiology, ICMR-National Institute of Cholera & Enteric Diseases, P-33, CIT Road, Scheme-XM, Beliaghata, Kolkata 700 010, West Bengal, India e-mail: drdebjitepi@gmail.com

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Abstract

Increased human–animal interfaces impose threats on human life by creating scope for the emergence and resurgence of many infectious diseases. Over the last two decades, emergence of novel viral diseases such as SARS, influenza A/H1N1(09) pdm; MERS; Nipah virus disease; Ebola haemorrhagic fever and the current COVID-19 has resulted in massive outbreaks, epidemics and pandemics thereby causing profound losses of human life, health and economy. The current COVID-19 pandemic has affected more than 200 countries, reporting a global case load of 167,878,000 with 2 per cent mortality as on May 26, 2021. This has highlighted the importance of reducing human– animal interfaces to prevent such zoonoses. Rapid deforestation, shrinking of boundaries between human and animal, crisis for natural habitation, increasing demands for wildlife products and threat of extinction compounded by biodiversity narrowing compel to increased human–animal conflict and contact. Large quantities of animal waste generated due to animal agriculture may also allow rapid selection, amplification, dissemination of zoonotic pathogens and facilitate zoonotic pathogen adaptation and hinder host evolution for resistance. Public health system faces challenges to contain such epidemics due to inadequate understanding, poor preparedness, lack of interdisciplinary approach in surveillance and control strategy and deficient political commitments. Because the management measures are beyond the purview of health system alone, policy-level adaptation in the transdisciplinary issues are required, emphasizing the engagement of multiple stakeholders towards wildlife protection, alternative land use, community empowerment for natural resource management and regulation on business of wildlife products to ensure comprehensive one health practice.

Keywords

Epidemic

human–animal interface

influenza

one health

SARS

zoonoses

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Global increase in human–animal interfaces and mixing of different species of animals in human-dense markets, facilitated the emergence of novel viral diseases such as severe acute respiratory syndrome (SARS), avian influenza A/H7N9, H5N1, Middle East respiratory syndrome (MERS); Nipah virus disease; Ebola haemorrhagic fever, Influenza A (H1N1) 09 pandemic and the current COVID-19 disease1 2 3. In 2002, the world was hit by SARS caused by SARS-CoV3; a decade later, the world witnessed the emergence of another novel corona virus, MERS coronavirus and both originated from animals and then transmitted to human1 2 3. Human Nipah virus infection, characterized primarily by fever and encephalitis, is another example of zoonotic disease causing recurrent outbreaks in some Asian countries4. Ebola haemorrhagic fever, another disease of zoonotic origin, is recognized worldwide as a severe, fatal disease-causing large-scale recurrent outbreak in African countries5. The ongoing COVID-19 pandemic caused by SARS-CoV-2 is another addition in this list. All these diseases have caused significant mortality and morbidity and have left a huge impact on health systems, society and economy of not only the affected States/countries but also the global economy. Although the emergence and re-emergence of zoonotic diseases causing recurrent outbreaks/epidemics have increased in the last three decades, but the holistic preventive measures are still lacking in most of the countries. In this review, we tried to understand how the increased human–animal interfaces put the global health under clinical, humanitarian, ethical crisis and the possible one health approach to reduce the threats of such diseases.

Emerging and re-emerging zoonotic infections causing recurrent large outbreaks/epidemics/pandemics

Severe acute respiratory syndrome (SARS)

In 2002, SARS started in Guangdong province of China and with time, it spread over 29 countries, causing 8422 cases and 916 deaths preparing a stage for global public health partnership6 7 8. However, identification and segregation of the intermediate amplifying hosts from humans led to successful containment of this outbreak in many places and finally, the pandemic ended within seven months of its origin. Epidemiologic tracking of this pandemic was possible due to viral genome sequencing. Identifying SARS-CoV-related viruses in Himalayan palm civets and Raccoon dogs6 7 8 confirmed its zoonotic origin. Though masked palm civets were initially perceived as animal of origin, genetically diverse coronaviruses for SARS have also been identified in various species of horseshoe bats (genus Rhinolophus)9.

Middle East respiratory syndrome (MERS)

In 2012, the outbreak of MERS coronavirus disease occurred in the Middle East10. Saudi Arabia was the country of origin, however, gradually it spread to Europe, Asia, Africa and North America11. At the beginning, due to its similar clinical manifestations and high case fatality rate (CFR) like SARS, it was called SARS-like illness as the other human coronaviruses usually caused mild, self-limiting upper respiratory tract illness12 (Table). Like SARS, MERS was also identified as a potential pandemic agent due to its transmissibility from person-to-person and limited effective therapeutic agents11. It was hypothesized that MERS probably originated from animal reservoirs and human infection happened as it crossed interspecies barriers12. Though the SARS epidemic died off quickly, MERS epidemic persisted for two years within a few countries. During April 2020, laboratory-confirmed MERS cases started to appear again from Saudi Arabia and till May 31, nine MERS cases got reported13.

Table Attributes of emerging and re-emerging infections threatening global public health

Attributes	COVID-19	MERS	Influenza A (H1N1) 09	SARS	Ebola virus disease	Human Nipah virus disease
Type	Pandemic34	Epidemic8 9 10 11	Pandemic31 32 33	Epidemic4 5 6 7	Large and recurrent outbreaks12 13 14 15 16 17 18 19 20	Outbreaks21 22 23 24 25 26 27 28 29 30 31 32
Yr of occurrence	201934	20128 9 10 11	200931 32 33	20024 5 6 7	1976;1977; 1994; 1995; 1996; 2001; 2003; 2008; 2012; 2014; 2017; 201812 13 14 15 16 17 18 19 20	1998; 2001 (since then recurrent in Bangladesh); 2006 and 2018 (in India)21 22 23 24 25 26 27 28 29 30 31 32
Originated at	Wuhan, China34	Saudi Arabia8	Mexico31 32 33	South China4 5 6 7	2014-Started at Guinea; 2017- DRC; 2018-Equator Province, DRC12 13 14 15 16 17 18 19 20	1998-Malaysia, Singapore; 2001-since then recurrent outbreak in Bangladesh; 2006-Siliguri, India; 2018-Kerala, India21 22 23 24 25 26 27 28 29 30 31 32
Spread at	Global34	Originated at Saudi Arabia; spread to Europe, Africa, Asia, North America8 9 10 11	More than 200 countries31 32 33	Originated at South China and then spread to Asia, Canada4 5 6 7	2014-Started at Guinea; 2017- DRC; 2018-Equator Province, DRC12 13 14 15 16 17 18 19 20	1998-Malaysia, Singapore; 2001-since then recurrent outbreak in Bangladesh; 2006-Siliguri, India; 2018-Kerala, India21 22 23 24 25 26 27 28 29 30 31 32
CFR (%)	Varies between <1 and 13.56%35	>35%8 9 10 11	0.4-6.7 per cent31 32 33	? 0%4 5 6 7	Varies between 25 and 90 per cent12 13 14 15 16 17 18 19 20	40-70 per cent21 22 23 24 25 26 27 28 29 30 31 32
Causative virus	SARS-CoV-234 35 36 37	MERS-CoV8 9 10 11	Influenza A/(H1N1) pdm0931 32 33	SARS-CoV4 5 6 7	Ebola virus11 12 13 14 15 16 17 18 19	Nipah virus21 22 23 24 25 26 27 28 29 30 31 32
Natural reservoir	Bats (potential host)34 35 36 37	Bats (?) (Neoromicia sp. in Africa)8 9 10 11	-	Chinese horseshoe bats (Rhinolophus sinicus and other Rhinolophus spp. in China)4 5 6 7	Three species of Fruit bats (Hypsignathus monstrosus; Epomops franqueti; Myonycteris torquata)12 13 14 15 16 17 18 19 20	Fruit bats also known as flying fox (order Chiroptera and genus Pteropus)21 22 23 24 25 26 27 28 29 30 31 32
Intermediate host	Pangolin (potential intermediate host)36	Dromedary camels (Middle East and Africa)8 9 10 11	-	Civets and raccoon dogs in southern China4	Monkey, apes, pigs12 13 14 15 16 17 18 19 20	Pigs21 22 23 24 25 26 27 28 29 30
Main transmissibility	Animal to human, person to person34 35 36	Animal to human, person to person8 9 10 11	Human to human; human to animal (reverse zoonosis)31 32 33	Person to person, animal to human4 5 6 7	Animal to human, person to person12 13 14 15 16 17 18 19 20	Animal to human, person to person21 22 23 24 25 26 27 28 29 30 31 32
Modes of transmission	Droplet, contact34 35 36	Droplet, contact8 9 10 11	Droplet, aerosol32 33 34	Droplet, contact, airborne4 5 6 7	Contact with infected animals; consumption of blood, milk, or raw or undercooked meat of infected animal; Person to person through direct contact with the blood; secretions or bodily fluids of infected persons; contact with contaminated needles, equipment12 13 14 15 16 17 18 19 20	Transmitted to humans from animals (such as bats or pigs), or contaminated foods and can also be transmitted directly from human to human21 22 23 24 25 26 27 28 29 30 31 32
Incubation period (days)	4-14, up to 2834 35 36	2-158 9 10 11	1-732 33 34	2-14, up to 214 5 6 7	2-2112 13 14 15 16 17 18 19 20	5-1421 22 23 24 25 26 27 28 29 30 31 32
Basic reproduction rate (R0)	2.2834 35 36	0.3-1.38 9 10 11	1.4-1.632 33 34	0.3-4.14 5 6 7	1.5-1.912 13 14 15 16 17 18 19 20	0.4821 22 23 24 25 26 27 28 29 30 31 32
Infection control measure	Standard contact and droplet precautions34 35 36	Standard contact and droplet precautions; airborne precautions for aerosol-generating procedures8 9 10 11	Standard contact and droplet precautions; airborne precautions for aerosol-generating procedures32 33 34	Standard contact and droplet precautions; airborne precautions for aerosol-generating procedures4 5 6 7	Standard contact precautions12 13 14 15 16 17 18 19 20	Standard contact precaution21 22 23 24 25 26 27 28 29 30 31 32

SARS-CoV, severe acute respiratory syndrome-coronavirus; MERS-CoV, Middle East respiratory syndrome-coronavirus; CFR, case fatality rate

Ebola virus disease

Another deadly virus of zoonotic origin having immense focus from international public health fraternity is Ebola virus. For the last 40 yr, African countries have faced many outbreaks of Ebola virus disease with a CFR ranging from 60 per cent to as high as 90 per cent5 14 15 16 17. The largest outbreak in West Africa started from Guinea14 and then spread to Sierra Leone, Liberia16 17 18 19 (Table). It took two years (2014-2016) to control the outbreak. The unprecedented scale of these outbreaks had potential to destabilize the fragile economy and health care systems of African countries17. Due to its transmissibility from animal-to-human and human-to-human, high CFR sparked the fear of international spread and it was identified as Category A priority pathogen20.

Human Nipah virus disease

Human Nipah virus outbreaks of Southeast Asia are example of another zoonotic disease, with high CFR4. The first recognized large outbreak of human Nipah virus occurred in Malaysia and Singapore and continued for almost a year from September 1998 to June next year4 21 22 23 24 25. The outbreak ceased after the infected herd of pigs of that region were slaughtered4. In Bangladesh, Nipah virus outbreaks have been recognized since 200125. Fruit bats of Pteropus species have been identified as the natural reservoir of Nipah virus25 26 27 28 29 (Table). It was also isolated from urine specimens collected from Pteropus hypomelanus in Malaysia22 and Pteropus lylei in Cambodia30. The isolated strains of Nipah in Bangladesh showed heterogeneity in their nucleotide sequence, suggesting repeated introductions of Nipah virus from its host to people of Bangladesh25 26 27 28 31 32.

Influenza A (H1N1) 09

In March, 2009, the pandemic Influenza HINI emerged as a lethal form of swine influenza virus infecting humans and also causing deaths in Mexico33. Due to its high transmissibility and potential lethality, in June 2009, the pandemic alert level was raised to phase 6 by the WHO33. Till mid-October 2009, 175 countries were affected33. In March 2010, more than 200 countries reported confirmed cases of Influenza A (H1N1) 09 and the global death count in that pandemic rose to 16,93133. However, in August 2010, the WHO declared that the virus has moved to the post-pandemic period33. The protein homology and phylogenetic analysis of the new Influenza A (H1N1) 09 demonstrated evolutionary trait to influenza A virus commonly in circulation in American countries for the last two decades and being evolved from swine viruses, emphasizing the role of pigs for this evolution to take place31 32 33.

COVID-19 pandemic

The ongoing pandemic caused by SARS-CoV-2 is another addition to the list of zoonotic diseases, putting humankind under immense threat (Table). It first broke in Wuhan, China, in December 2019 and was possibly related to a local seafood market, however, this has not been proved so far34 34 35 36 37 38 39. Bats have been mentioned as its natural reservoir as it is known to harbour a variety of CoVs, including SARS-CoV- and MERS-CoV-like viruses37 38 39. The non-availability of bats for sale in that sea market, sparked the debate on the existence of alternative intermediate hosts as genome sequencing of COVID-19 showed 96.2 per cent similarity to the Bat CoV RaTG1339. However, the coronavirus identified from Malayan Pangolins had a similarity of 91.02 per cent to SARS-CoV-2, indicating the probability of Pangolins being the intermediate host of SARS-CoV-240. According to The initial reported studies from China, 31.3 per cent of the patients had a history of travel to the place of origin, whereas 72.3 per cent of the patients had a contact history of people visiting from Wuhan39 Though it originated from animal source, the transmissibility of this virus is mainly human-to-human39. During SARS-CoV and MERS-CoV epidemics, nosocomial route was identified to be a major route of spreading infection5. In the case of SARS-CoV-2, the possible routes of transmission are still under research.

As of August 31, 2020 globally 24,413,598 COVID-19 cases with a CFR of 3.3 per cent have been reported41. The USA has so far reported a case burden of 18,637 per million population with a CFR of three per cent41 followed by Brazil, having an incidence of 18,149/million population with a CFR of 3.1 per cent. More than 200 countries across the globe have been affected by the COVID-19 pandemic. European countries being the worst hit, Spain has reported an incidence of 9744 cases/million population with a CFR of 6.4 per cent41. Italy, France, Germany and the UK have reported an incidence of 4437/million, 4257/million, 2902/million and 4923/million, respectively41. Though originated from China, the reported incidence till date was 58/million Chinese population, whereas, Qatar, Singapore, Israel, Iran and Turkey reported an incidence of 42,230/million, 9698/million, 12,509/million, 4458/million and 3179/million, respectively41. Among the mentioned Asian countries, Iran reported the highest CFR of 5.7 per cent41. Asian countries altogether shared 27.6 per cent (7,010,590/25,413,598) of the total global COVID-19 cases and contributed 16.6 per cent of the (141,479/851,078) global COVID-19 deaths41. Till the month of April 2020, European countries shared 43.3 per cent of the global COVID-19 cases (1,325,314/2,828,826), in August, it reduced to 14.02 per cent with 24.4 per cent share to the global COVID-19 deaths (207,565/851,078)41.

Increasing human–animal interfaces & potential impact

Increased human–animal interfaces impose repeated threats on human life by creating scope for the emergence of various new infectious diseases. Rapid deforestation leading to shrinking of boundaries between the human and the animals and further approach of human to wildlife for livelihood leave the animals threatened due to destruction of their habitat. Increased demands for wildlife products lead to poaching and trafficking. Decreasing biodiversity also compels animals to search for food in neighbouring human dwelling, and all these lead to an increase in human–animal conflict and contact as well.

As in the industrialized countries, developing countries also have started doing intensive animal agriculture mainly of chickens and turkeys to meet the demand of meat supply and usually 15,000-50,000 birds are reared together under a long shade42 43. This unnatural indoor confinement of a large number of animals in a limited air space and production of large quantities of waste probably allow rapid selection, amplification and dissemination of zoonotic pathogens44. In 2005, Woolhouse and Gowtage-Sequeria45 reviewed 177 emerging or re-emerging human pathogens. Changes in land use and agriculture were identified to be the major causes of their appearance46. Another concern is extinction or risk of extinction of many breeds of animals, and this leads to the loss of genetic diversity in modern livestock production47. The narrowly focused breeding schemes are actually creating a genetic bottleneck which may finally increase the probability of disease susceptibility by facilitating adaptation of zoonotic pathogen and hindering host evolution for resistance against the pathogens48.

Identified major gaps in outbreak/epidemic/pandemic preparedness & response strategy

The definitions of outbreaks/epidemics/pandemics are primarily driven by their geographic spread49 50. Each of these events has its own frequency, severity and disease characteristics requiring optimal preparedness and response strategy. However, from the past and the current experience, it is evident that each time the discussed diseases have put major challenge to the public health fraternity due to49 50 51: (i) lack of understanding and knowledge among the communities regarding outbreaks/epidemics/pandemics; (ii) poor preparedness of health system to deal with catastrophic health events; (iii) resource constraints particularly in low- and middle-income group countries; (iv) poor surveillance and monitoring; (v) lack of interdisciplinary one-health approach to reduce the threats of emerging infectious diseases; and (vi) fundamental bureaucratic and public management capacities.

With the repeated occurrence of these events, it is important to understand that the direct health impact is catastrophic. The indirect health impacts can increase the mortality and morbidity further due to diversion or depletion of resources for routine care and less access to routine care due to travel restrictions/fear49. Increased probability of infection, deaths and fear leads to decreased availability of healthcare workers during the epidemics/pandemics, making the situation further worse. The impacts of large outbreaks/epidemics/pandemics are also noticed at the societal and political levels, leaving the affected ones to deal with social stigma, whereas it may reduce state capacity to manage instability50.

Allied issues requiring urgent policy adaptation to reduce the effect of increasing human–animal interfaces

Certain changes in pathogens which allow them to pass from animals to humans may be increased by modification or destruction of the natural ecosystems. Deforestation and species collection and trafficking, open animal markets followed by increased risk of zoonosis have been identified as the pathways leading to epidemic or pandemic50 51. There are transdisciplinary issues requiring urgent policy-level adaptation to mitigate this complex issue50 51 52: policies to engage international bodies, local governments, non-governmental organizations, communities and consumers for effective prevention of human–wildlife conflict; policies for protected key areas, creating buffer zones for wildlife and investing in alternative land uses; policies related to empowering communities to manage their relationship with wild animals as a part of community-based natural resource management plan; policies related to compensation or insurance for animal-induced damage; policies related to payment for environmental services and policies regarding selling and buying of wildlife-unfriendly products.

Currently, the world is experiencing the complexities of a threatening novel infectious disease COVID-19. The animal origin of SARS-CoV-2, then its human transmission and even presence of it in environmental samples53 reflects the importance of having a linkage between veterinary services, local farming community, sellers and consumers which needs to be continuously monitored. However, establishment of such mechanism requires a thorough assessment53. These linkages are essential for rapid communication and response mechanisms to control disease53. These emphasize the need to develop and nurture an efficient epidemiology surveillance network and exhaustive national territorial meshing to capture the animal diseases inclusive of zoonotic and emerging diseases53. In conclusion, this is the right time globally to undertake interdisciplinary one-health approach to understand the interrelationship between environment, humans and animals for improving the health outcomes of all.

Financial support & sponsorship: None.

Conflicts of Interest: None.

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World Wide Fund for Nature. Common ground - solutions for reducing the human, economic and conservation costs of human wildlife conflict. Available from: https://wwf.panda.org/our_work/wildlife/problems/human_animal_conflict/
World Wide Fund for Nature. The loss of nature and rise of pandemics. Available from: https://wwf.panda.org/?361716
Xinhuanet. Wuhan seafood market may not be only source of novel coronavirus: expert. Available from: http://www.xinhuanet.com/english/2020-01/29/c_13∥063.htm
National Research Council (US) Committee. Achieving sustainable global capacity for surveillance and response to emerging diseases of zoonotic origin: Workshop report. Available from: https://www.ncbi.nlm.nih.gov/books/NBK215315/

Emerging and re-emerging zoonotic infections causing recurrent large outbreaks/epidemics/pandemics

Increasing human–animal interfaces & potential impact

Identified major gaps in outbreak/epidemic/pandemic preparedness & response strategy

Allied issues requiring urgent policy adaptation to reduce the effect of increasing human–animal interfaces

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Increased human-animal interface & emerging zoonotic diseases: An enigma requiring multi-sectoral efforts to address

Abstract

Keywords

Epidemic

human–animal interface

influenza

one health

SARS

zoonoses

Emerging and re-emerging zoonotic infections causing recurrent large outbreaks/epidemics/pandemics

Severe acute respiratory syndrome (SARS)

Middle East respiratory syndrome (MERS)

Ebola virus disease

Human Nipah virus disease

Influenza A (H1N1) 09

COVID-19 pandemic

Increasing human–animal interfaces & potential impact

Identified major gaps in outbreak/epidemic/pandemic preparedness & response strategy

Allied issues requiring urgent policy adaptation to reduce the effect of increasing human–animal interfaces

References

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