Definition of snack for English Language Learners. : to eat a small amount of food between meals : to eat a snack.
Swine influenza virus is common throughout pig populations worldwide. Transmission of the virus from pigs to humans is not common and does not always lead to human flu, often resulting only in the production of antibodies in the blood. If transmission does cause human flu, it is called zoonotic swine flu.wine influenza virus (SIV) or swine-origin influenza virus (S-OIV) is any strain of the influenza family of viruses that is endemic in pigs.
The flu is a respiratory illness that most often occurs in winter and early spring. The respiratory illness is caused by either the Influenza A or influenza B virus. The flu is highly contagious and is typically spread through physical contact or contact with mucous or respiratory droplets.