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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
A serious new warning has been established for pregnant women against taking ACE inhibitors during pregnancy. In the study, the risk of major birth defects in children whose mothers took ACE inhibitors during the first trimester was nearly three times higher than in children whose mothers didn't take ACE inhibitors. Physicians can prescribe alternative medications for pregnant women who have symptoms of high blood pressure.
Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.