How is Trypanosoma transmitted by infected to healthy persons?

How is pneumonia transmitted from infected person to healthy persons?

Bubonic plague is transmitted by:

How are diseases transmitted from the reservoir of infection to a healthy person?

How is the disease transmitted to the others?

How does filarial worm affect the body of infected person(s)?

What is a synapse?How is the nerve impulse transmitted across a chemical synapse?

A laboratory blood test is 99% effective in detecting a certain disease when it is in fact, present. However, the test also yields a false positive result for 0.5% of the healthy person tested (i.e. if a healthy person is tested, then, with probability 0.005, the test will imply he has the disease). If 0.1 percent of the population actually has the disease, what is the probability that a person has the disease given that his test result is positive ?