Disease Causative Agents

The process of introduction of killed or weakened microbe in a healthy body is called vaccination. No vaccination is available for malaria. 

Disease causing microorganisms are called pathogens. 

Plague spreads by means of insect vectors. Flea is responsible for transmitting plague-causing microorganisms from rats to human beings.

Hepatitis is a swelling and inflammation of the liver. Hepatitis F appears to be transmitted by the oral fecal route in a similar manner to that of hepatitis A and E, although the epidemiology of the virus has not yet been fully established. Hepatitis F virus (HFV) first appeared as togavirus like 60 to 70 nm enveloped particles that were recovered from the hepatocytes of a number of patients transplanted for fulminant hepatic failure.  

Measles can spread through direct or indirect contact with infected persons.

Respiratory system is mostly affected by diseases transmitted through air.

Measles virus is transmitted through the air.

Influenza virus passes into air from nose, throat and lungs of an infected person when he coughs or sneezes. They are expelled in the form of five droplets in air which can infect a healthy person.

Viral (Measles and chickenpox) and fungal diseases spread through direct contact.

Plague spreads through vectors like rat fleas

Tuberculosis spread through air or through indirect contact.

If the water supplied in towns and cities is not processed properly, cholera outbreak could occur as it is transmitted by water.

Typhoid is transmitted through water. Therefore, using contaminated water can cause typhoid.

Dysentery causing organisms are transmitted through water.

Mumps spread through air droplet infection.