Question

Although the numbers and virulence of microorganisms help determine whether a person acquires an infection, another major factor is:

Answer 1

The environment and the human's body contain microorganisms.

Step-by-step explanation:

Most of them are not disease causing organisms. It is only when there is infection that it is now a matter of how the host can defend that determines how fast the person recovers.

The use of antimicrobial drugs can lead to serious infections that is caused by drug resistant microorganisms.

Answer 2

The host ability to defend itself against the invader.

Step-by-step explanation:

There are two major factors which determine whether a person acquires an infection or not and these factor are the characteristic and number of pathogen and the ability of the host to defend it from the pathogen.

For spreading infection in the host the pathogen must be in a good and suitable and number and must have virulence factor-like toxins, capsules, etc.

The host immune system helps in resisting the infection of any pathogen therefore it is important for pathogens to evade host immune systems to cause infection. So host's ability to defend itself against the invader is another factor that determines whether a person acquires an infection.