Protecting National Poultry: Import Ban Implemented

In a proactive move to safeguard its domestic poultry industry, Mexico’s Ministry of Agriculture and Rural Development has announced a temporary suspension of poultry product imports from Brazil. This decision, effective promptly, follows the confirmed detection of the highly pathogenic H5N1 avian influenza virus (HPAI) on a farm in Montenegro, Rio Grande do Sul, Brazil, on May 15th.

Global Spread and Impact of H5N1

The H5N1 virus is not limited to poultry. According to Mauricio Rodríguez Álvarez, a UNAM Faculty of Medicine academic and spokesperson for the University Program for Epidemiological and Emerging Risks, the virus has been detected in a growing range of species, including marine and land mammals such as seals, sea lions, felines, canids, and bovids.

the United States has experienced significant challenges with avian influenza. Since 2024, approximately 640 outbreaks have been reported on poultry farms, impacting an estimated 89.6 million birds. This has led to a considerable decrease in egg, chicken, and turkey production, subsequently driving up prices for consumers. Furthermore, over 165 cases have been identified on dairy farms across 17 states, necessitating regulatory measures for milk processing and sales.

The impact of virus A (H5N1) on poultry production and the dairy industry in the United States and other countries, and its potential transmission to other animals and humans are sufficient elements to keep the alerts on and reinforce surveillance actions.
Mauricio Rodríguez Álvarez, UNAM Faculty of Medicine

Avian Flu in Mexico: A Growing Concern

Globally, there’s an increasing trend of avian influenza detections in both wild and domestic animals, including those in captivity for food production or conservation. This rise in cases has led to a corresponding increase in human infections, primarily through occupational or recreational contact with infected animals.

One notable exmaple involves domestic cats contracting the virus after consuming milk from infected cows on dairy farms. These cats then potentially introduce the virus into closer proximity to human populations.

Mexico has already reported its first human case of H5N1 avian influenza – a young girl from Durango who tragically succumbed to the illness. this, coupled with a previous case involving the H5N2 virus in June 2024, underscores the escalating risk.

In several countries, the number of reports of avian influenza cases has increased in various animal species and also in humans. In Mexico the first human case was already reported by virus A (H5N1)… All this has configured a potentially risky situation.

Two Critical Transmission Thresholds

Rodríguez Álvarez highlights two critical stages in the evolution of avian influenza viruses.The first,known as “spillover,” involves the virus jumping from birds to other species,especially humans. This phenomenon is being observed with increasing frequency.

The second, and currently unrealized, critical step is human-to-human transmission.

for the H5N1 virus to spread between people, it would need to undergo specific mutations that allow it to effectively replicate within the human respiratory tract, maintain its ability to infect human cells, and evade the human immune system. The more frequently avian influenza infects humans, the greater the likelihood of the virus adapting for human-to-human transmission.

Interestingly, some experts suggest that as a virus becomes more contagious, its ability to cause severe illness may decrease. From an evolutionary viewpoint, a virus benefits more from easy transmission than from killing its host, as this ensures continued circulation. This pattern was observed with SARS-cov-2, the virus responsible for the COVID-19 pandemic, where initial variants were highly aggressive, but later strains became less dangerous and more contagious.

Food Safety: Is There a Risk?

The question remains: do consumers face a risk of contracting avian influenza from consuming eggs, chicken, or milk? Further facts is needed to address this concern.

Understanding the Current Avian Influenza Landscape

Avian influenza, particularly the H5N1 strain, remains a persistent concern globally. While direct human-to-human transmission is rare, the potential for zoonotic spread and the impact on food security necessitate vigilant monitoring and proactive strategies. The interconnectedness of environmental, animal, and human health, often referred to as “One Health,” is crucial in addressing this complex issue.

Transmission Pathways and Risk Mitigation

The primary route of avian influenza transmission is through respiratory secretions and, occasionally, the feces of infected birds. While the consumption of properly cooked poultry and eggs poses minimal risk, direct contact with sick animals and materials contaminated with the virus presents a significant threat.

Avian influenza is spread through the respiratory secretions of sick animals and, sometimes, of their feces. It is usually not transmitted by the consumption of eggs or chicken meat. If these products are well cooked, there will be no problem. What does imply a risk is to be in contact with sick animals that spread the virus.

Vaccination Strategies: Protecting Poultry and Preparing for Human Health

Vaccination plays a vital role in mitigating the impact of avian influenza outbreaks in poultry populations. In Mexico, for example, vaccines are strategically employed to prevent widespread culling of birds, thereby safeguarding egg and poultry production.This proactive approach helps to stabilize the food supply and prevent price increases.

While widespread human vaccination is not currently deemed necessary, preparedness is paramount. Experts emphasize the importance of developing strategies to secure adequate supplies of vaccines tailored to the specific viral strain responsible for any potential outbreak or pandemic, drawing lessons from the SARS-CoV-2 experiance.

The “One Health” Perspective: A Holistic Approach

Addressing avian influenza requires a holistic “One Health” approach, recognizing the intricate links between the habitat, animal health, and human well-being. The virus’s natural presence in wild bird populations, coupled with factors like deforestation and intensive animal farming, increases the risk of transmission to humans.

Beyond direct human health concerns, avian influenza can severely disrupt food production, leading to economic instability. A comprehensive strategy must encompass disease prevention,environmental stewardship,and responsible animal management.

Avian influenza can also compromise the production capacity of animal food, such as egg, chicken and turkey meat, and milk, and cause an acute food crisis with very relevant economic consequences. That is why it is essential to address it from the perspective of what is known as ‘a single health’, which understands that the environment, animal health and human health are interconnected.

Global Collaboration and Disease Prevention

Effective avian influenza control necessitates international collaboration and a strong emphasis on disease prevention. This includes robust surveillance systems, rapid response mechanisms, and public awareness campaigns to educate communities about the risks and preventive measures. By fostering a culture of prevention and working together across borders, we can better protect both human and animal health.

The Imperative of International Collaboration in Influenza Monitoring

In an interconnected world, the rapid spread of infectious diseases like influenza poses a significant threat to global health security. Effective prevention and mitigation strategies rely heavily on timely and transparent interaction between nations, particularly regarding potential outbreaks. The consequences of delayed or inadequate information sharing can be far-reaching, potentially overwhelming national healthcare systems and disrupting economies.

consider the devastating impact of the 2009 H1N1 pandemic. Initial delays in reporting and coordinating international responses exacerbated the spread of the virus, highlighting the critical need for robust surveillance and open communication channels. Today, with increased global travel and interconnectedness, the risk of rapid disease transmission is even greater.

mexico’s Call for Enhanced Communication with the United States

Concerns have been raised regarding the potential impact of inadequate communication from neighboring countries, specifically the United States, in the event of a serious influenza outbreak. According to health experts, a lack of timely and transparent information sharing could severely hinder Mexico’s ability to implement effective preventative measures.

The sentiment underscores the vital role of cross-border collaboration in safeguarding public health.Open lines of communication are essential for enabling rapid responses and preventing the uncontrolled spread of influenza viruses.

In the event of a significant influenza outbreak in the United States, a failure to communicate this information promptly and transparently would substantially impede our ability to mount an effective response and protect our population.

Strengthening Regional and Global Surveillance Strategies

To mitigate the risks associated with influenza outbreaks, it is crucial to reinforce surveillance strategies at both regional and global levels. This includes fostering close communication between countries, such as Mexico and the United States, to ensure the timely exchange of information regarding potential threats. Moreover, reporting to international organizations like the World health Organization (WHO) and the Pan American health Organization (PAHO) is paramount for coordinated global responses.

The WHO’s Global Influenza Surveillance and Response System (GISRS) plays a critical role in monitoring influenza viruses worldwide. However, its effectiveness depends on the active participation and transparent reporting of member states. Any breakdown in communication or surveillance efforts can have cascading effects, potentially jeopardizing global health security.

Mexico needs to maintain close communication with authorities in the United States,sharing information about developments in both countries. Reporting to the WHO and PAHO is also essential, as a failure to communicate problems promptly can have widespread consequences.

The Broader Implications for Global Health Security

The emphasis on transparent influenza surveillance highlights a broader need for strengthened global health security infrastructure. This includes investing in robust surveillance systems, promoting international collaboration, and ensuring timely and transparent communication between nations. Failure to address these critical areas could leave the world vulnerable to future pandemics and other public health emergencies.

The COVID-19 pandemic served as a stark reminder of the devastating consequences of inadequate preparedness and delayed responses. Learning from these experiences is essential for building a more resilient and secure global health system.