Understanding Avian Influenza A H9N2 in Italy Recent Outbreaks and Their Impact on Poultry and Public Health

Avian Influenza A H9N2 has recently emerged as a significant concern in Italy, affecting both the poultry industry and public health. This strain of avian flu, while generally considered low pathogenic compared to other influenza viruses, has shown increasing activity in Italian poultry farms. Understanding the current situation, transmission routes, symptoms, and the broader impact is essential for farmers, public health officials, and the general public. This article explores the recent outbreaks in Italy, the virus’s effects, and the measures taken to control its spread.

Poultry farm affected by Avian Influenza A H9N2 in Italy

Recent Outbreaks of Avian Influenza A H9N2 in Italy

In the past year, Italy has reported multiple outbreaks of Avian Influenza A H9N2, primarily in the northern regions where poultry farming is concentrated. According to the Italian Ministry of Health, over 30 poultry farms have been affected since early 2023, with cases rising sharply during the colder months. These outbreaks have led to the culling of tens of thousands of birds to prevent further spread.

The virus has been detected mainly in commercial chicken and turkey farms, but some cases have also involved backyard flocks. The outbreaks have caused significant economic losses due to decreased production, trade restrictions, and increased biosecurity costs.

Experts from the Istituto Zooprofilattico Sperimentale (IZS) have noted that the H9N2 strain circulating in Italy shows genetic similarities to strains found in other European countries and parts of Asia, suggesting cross-border transmission through migratory birds or trade.

How Avian Influenza A H9N2 Spreads

Avian Influenza A H9N2 spreads primarily through direct contact between infected and healthy birds. The virus is present in the saliva, nasal secretions, and feces of infected birds, which contaminate the environment. Key transmission routes include:

• Direct bird-to-bird contact in farms or live bird markets

• Contaminated equipment, clothing, and vehicles moving between farms

• Wild migratory birds acting as carriers and spreading the virus across regions

• Airborne particles in densely populated poultry houses

  
  

Humans can also become infected, though this is rare and usually occurs through close contact with infected birds or contaminated environments.

Symptoms in Poultry and Humans

In Poultry

The H9N2 strain is classified as low pathogenic avian influenza (LPAI), meaning it generally causes milder symptoms compared to highly pathogenic strains. However, it can still lead to:

• Reduced egg production

• Mild respiratory signs such as coughing, sneezing, and nasal discharge

• Decreased weight gain and poor feed conversion

• Increased mortality in some cases, especially when combined with secondary infections

  
  

These symptoms can be subtle, making early detection challenging without laboratory testing.

In Humans

Human infections with H9N2 are uncommon but have been documented, mostly in people with close contact with poultry. Symptoms in humans resemble those of seasonal flu:

• Fever

• Cough

• Sore throat

• Muscle aches

  
  

Most human cases have been mild, and there is no evidence of sustained human-to-human transmission. Nevertheless, health authorities monitor these cases closely due to the potential for the virus to mutate.

Impact on Poultry Industry and Public Health

The outbreaks of Avian Influenza A H9N2 have a dual impact:

Economic Impact on Poultry Farming

Italy’s poultry sector is a vital part of its agricultural economy. The virus causes:

• Losses from bird mortality and culling

• Reduced productivity and egg output

• Increased costs for biosecurity and disease control

• Trade restrictions affecting exports

  
  

For example, a recent outbreak in Lombardy led to the culling of over 50,000 birds and temporary closure of several farms, costing millions of euros.

Public Health Concerns

Though H9N2 is less severe than other avian influenza strains, its presence raises concerns about zoonotic transmission. The virus’s ability to infect humans, even sporadically, highlights the need for vigilance. Experts warn that continuous circulation in poultry increases the risk of genetic changes that could make the virus more transmissible or virulent in humans.

Preventive Measures to Control H9N2 Spread

Controlling Avian Influenza A H9N2 requires coordinated efforts between farmers, veterinarians, and government agencies. Key preventive measures include:

• Strict biosecurity protocols on farms to prevent virus introduction and spread

• Regular surveillance and testing of poultry flocks, especially in high-risk areas

• Isolation and culling of infected or exposed birds to contain outbreaks

• Proper disposal of carcasses and contaminated materials

• Vaccination programs where appropriate, although vaccine use varies by region and strain

• Public education for poultry workers and the general public on safe handling and hygiene

  
  

Farmers are encouraged to limit farm access, disinfect equipment, and monitor bird health daily.

Government Response and Expert Recommendations

The Italian government has implemented several measures to address the H9N2 outbreaks:

• Enhanced surveillance programs coordinated by the Ministry of Health and regional veterinary services

• Emergency response plans including rapid diagnosis, containment, and compensation for affected farmers

• Collaboration with European and international health organizations to track virus evolution

• Public communication campaigns to raise awareness among poultry workers and consumers

  
  

Experts from the IZS recommend maintaining vigilance even outside outbreak periods, investing in research to understand the virus better, and preparing for potential changes in the virus’s behavior.

What This Means for Consumers and the Public

For consumers, the risk of contracting H9N2 from poultry products is very low. Proper cooking kills the virus, and food safety standards in Italy are strict. However, people working with live birds should follow safety guidelines to reduce exposure.

The ongoing outbreaks remind us of the importance of monitoring animal diseases that can affect human health. The H9N2 virus serves as a warning about the interconnectedness of animal and human health, emphasizing the need for a One Health approach.