Avian flu

Information about avian influenza and how it can affect both people and birds.

Table of Contents

Avian influenza

Avian influenza refers to an infection of birds with avian (bird) influenza (flu) Type A viruses. These viruses occur naturally among wild aquatic birds worldwide and can infect domestic poultry and other bird and animal species. Avian influenza viruses do not normally infect humans. However, sporadic human infections with avian influenza viruses have occurred, most commonly following direct or close contact with infected poultry or their living environment. This page offers resources and links to information about avian influenza for different audiences.

The CDC also provides additional information on avian influenza.

Avian influenza A virus infections in humans

Although avian influenza A viruses do not typically infect humans, rare cases of human infection with these viruses have been reported. Most human infections with avian influenza A viruses have occurred following direct or close contact with infected poultry or their living environment. Illness in humans has ranged from mild to severe.

The spread of avian influenza A viruses from one ill person to another has been reported very rarely, and has been limited, inefficient and not sustained. However, because of the possibility that avian influenza A viruses could change and gain the ability to spread easily between people, monitoring for human infection and person-to-person transmission is extremely important for public health.

Avian Influenza: Information for Health Professionals and Laboratorians This link provides information from CDC on testing, reporting, treatment, and infection control for suspected cases of avian influenza in humans. If you suspect avian influenza in a patient due to symptoms and recent travel/exposure/risk, please contact the Division of Epidemiology immediately at 617-983-6800 for further direction on specimen collection and next steps. For more information on testing and surveillance, please visit the Infection Control, Testing, and Surveillance page.

The CDC provides additional information on Avian Influenza in Humans.

Avian influenza A virus infections in birds

Avian influenza refers to an infection of birds with avian influenza Type A viruses. These viruses occur naturally among wild aquatic birds worldwide and can infect domestic poultry and other bird and animal species. Wild aquatic birds can be infected with avian influenza A viruses in their intestines and respiratory tract, but usually do not get sick. However, avian influenza A viruses are very contagious among birds, and some of these viruses can sicken and even kill certain domesticated bird species including chickens, ducks, and turkeys.

Infected birds can shed avian influenza A viruses in their saliva, nasal secretions, and feces. Susceptible birds become infected when they have contact with the virus as it is shed by infected birds. They also can become infected through contact with surfaces that are contaminated with virus from infected birds.

Avian influenza A viruses are classified into the following two categories: low pathogenic avian influenza (LPAI) A viruses, and highly pathogenic avian influenza (HPAI) A viruses, referring to the molecular characteristics of a virus and the virus’ ability to cause disease and mortality in chickens in a laboratory setting.

The CDC provides additional information on Avian Influenza in Birds.

Massachusetts Department of Agricultural Resources Diagnostic Testing Services

Additional resources

Help Us Improve Mass.gov  with your feedback

Please do not include personal or contact information.
Feedback