People can have the rhinovirus more than once because they have no while blood cells it hides then re-attacks later the body can't make antibodies there are many types of the virus

there are many types of the virus

Explanation:

Rhinovirus is a term used to refer to a group of picornavirus viruses. Because there is a variety of viruses with this name, people can become infected with rhinoviruses more than once. These viruses are best known for causing colds and are easily transmitted from an infected person to a healthy person. In addition, complications caused by this virus can lead to asthma, cystic fibrosis, bronchitis, and pneumonia.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.