Infection diseases happens when an unknown organism move into a person’s body and causes trauma such as bacteria, viruses, fungi and parasites. There are a lot of organisms in human body which normally harmless and helpful, but some may cause disease if the condition were alter. These organism stay in human 's’ body to help itself survive by reproduce and clonation. The infectious diseases can be easily passed from one to another. For instance, though the channel by bites from insects or animals. Beside, others are obtained by consumed contaminated food or drinks which being exposed to the environment with the organisms. In addition, the signs and symptoms of the diseases are extend depending on the organism which causing the infection. For examples which often happen as fever, diarrhea, fatigue, muscle aches, coughing. If the organisms did not very active, the mild infection will respond to rest and home remedies. However, some organisms which reproduce rapidly and cause life-threatening infections may require hospitalization. Many infectious diseases such as measles and chickenpox can be prevented by vaccines (Nordqvist. C, 2017). Taking a good care on the basic hygiene such as frequent and thorough hand-washing also helps protect from most infectious diseases.
There are two levels of immunity in the human immune system which is the specific and nonspecific immunity. To defend the foreign materials that perceived to be harmful, the human body protects itself though the