Vaccines help stimulate your immune system to fight off certain diseases. A compromised immune system can't recognize and fight off bacteria, viruses or other germs the way a healthy immune system can.

Malaria is an infectious disease caused by a parasite that's transmitted by mosquitoes. The illness results in recurrent attacks of chills and fever, and it can be deadly.

When you have a food allergy, your body thinks certain foods are trying to harm you. Your body fights back by setting off an allergic reaction. In most cases, the symptoms are mild—a rash, a stuffy nose, or an upset stomach. A mild reaction is no fun, but it is not dangerous. A serious reaction can be deadly. But quick treatment can stop a dangerous reaction.

Now, most people know that asthma is a disease that affects the lower respiratory system...

   Viral and bacterial conjunctivitis can be relieved by warm compress and eye drops or pills are used to treat allergic conjunctivitis. Different types of conjunctivitis have different symptoms and require different treatments...