However, the influenza virus notoriously mutates, or changes, such that the new virus is not recognized by the immune system and can infect even those who have been vaccinated.
Survivors who kept pressure under control helped prevent a second 'bleeding stroke,' study found
Should you wash fresh fruits and vegetables before eating them? The Food and Drug Administration says that washing produce in plain water can help eliminate any pesticide residues left on the food. Supermarkets don't wash produce before putting it out for sale. Use plain water -- no soap -- and scrub with a brush when appropriate. For leafy vegetables like lettuce and cabbage, discard the outer leaves.