CDC Bird Flu

Bird flu (H5N1) is caused by influenza A, primarily infecting birds. Unlike human flu, it:
-Transmits animal-to-human via contact with infected animals or surfaces (not human-to-human via droplets).
-Causes more severe illness with higher mortality.

The first human outbreak of H5N1 occurred in April 2024. By October 2024, 36 cases were reported in the U.S., mainly in California (16 cases) and Washington (6 cases).

Bird flu spreads via direct contact with infected animals, contaminated surfaces, or their secretions.

High-risk groups include:

Farmworkers and those handling birds.
Healthcare workers treating infected patients.
People living near infected animals.

Bird flu is detected using:

PCR tests (analyzing respiratory samples like nasal/throat swabs for viral RNA).
Serological tests (detecting antibodies in blood for past exposure).
Genetic sequencing (to track virus spread and mutations).

Early stage: PCR detects viral RNA during symptom onset.
Later stage: Serological tests identify antibodies after the immune response develops.

Bird flu requires Biosafety Level 3 (BSL-3) precautions.
Workers must use PPE to prevent exposure.
These measures slow sample collection and analysis during outbreaks.

Confidence is high. CDC testing found no evidence of human-to-human transmission, e.g., Missouri healthcare workers in close contact tested seronegative.

No specific H5N1 vaccine exists yet, but candidate vaccines are in development.
Vaccine production requires selecting a suitable virus strain and extensive testing.
Adding H5N1 to seasonal flu vaccines depends on its future impact.

*Monitors outbreaks and tests exposed individuals.
*Conducts lab testing for H5N1.
*Provides guidelines with the USDA/FDA.
*Collaborates with WHO for global data sharing.