Text-onlyInfluenza ("flu") is a
contagious disease. It is caused by the influenza virus, which
... difficulty breathing, hoarseness or wheezing,
hives, paleness, weakness, a fast heart
... Glossary Reference... allergic reaction that is characterized by
hives, itching, respiratory difficulty, and shock; this condition
... also the name of a
contagious viral illness that causes fever,
...