Hepatitis A is liver inflammation caused by HAV virus. Spread through contaminated food/water and person-to-person contact. Incubation period is 14-28 days. Most children (90%) infected before age 10 without symptoms
Early signs include aggression, irritability, and loss of appetite. Rabies progresses through three stages: prodromal, furious, and paralytic. Symptoms can appear 10 days to a year after exposure. Virus can live on cat skin for up to 2 hours
Measles is highly contagious viral infection affecting nose, windpipe and lungs. Virus spreads through coughing, sneezing and contaminated surfaces. Transmission occurs 1-2 days before symptoms to 4 days after rash appears
Flu is a viral respiratory illness causing fever, chills, and cough. Spreads easily through airborne droplets and contaminated surfaces. Most people recover fully, but high-risk groups face severe complications
Rabies is a viral disease causing brain inflammation in animals. Primarily infects mammals, but can infect birds and cell cultures. Causes aggressive behavior and hydrophobia, increasing transmission risk. Virus accumulates in saliva, often creating "foaming at mouth" effect
Influenza A virus is an enveloped negative-sense RNA virus with segmented genome. Virus has two surface proteins: hemagglutinin (HA) and neuraminidase (NA). Subtypes defined by combination of H and N proteins, e.g. H1N1. Almost all possible combinations of H and N found in wild birds