H5N1 Human Cases H5N1 Virus Global Spread Previous Cases Animal Species H5N2 Virus Vaccination Cattle Infection Galveston County Impact on Dairy Farming Outbreaks Avian Influenza Symptoms Protective Measures Precautions Type A H5N1 Virus Transmission History Human Transmission Human Case Cattle Recent Developments Impact on Milk Consumption Geographical Spread Animal Transmission