That is a loaded question and would take a book to explain all the reasons of which I can only name a few examples. Genetic predispostion to certain diseases, lowered immunity, inadequate nutrition to build a healthy immune system, improper medical care, no prenatal care, etc.
Another factor is overprotecting (to an extreme) children so that they are never exposed to normal colds and flu, mumps, measles, chicken pox, etc. Some advocate having chicken pox parties to expose kids to dieseases but that , IMHO, is going a bit too far.
Research has found some interesting links to Asthma, for example. Many children who did not grow up with pets in the house had more asthma than others who did (in general, certainly this is not a rule or anything).
Many children who have Chrones Disease were found to have had extremely sterile home bathroom environments often each child having his/her own bathroom exclusively so that they did not get exposure to other germs in order to build up some defense mechanisms than others who grew up in less rigid environments.
This is what I had read and seen on Health channels and I am only relaying some interesting information.
Hyperthyroidism is not a contagious disease. The stress of disease or pregnancy can sometimes trigger hyperthyroidism in a susceptible individual however.
This person is called a carrier. Some carriers do not show any signs of the disease but others do (as someone with a cold).
A susceptible individual who can harbor the disease is often referred to as a "host." This individual provides an environment for the pathogen to thrive and potentially cause illness. Host factors such as age, immune status, and genetics can influence the likelihood of becoming infected.
A carrier is a person who harbors a disease. They can spread viruses through various forms of contact with other people. Diseases continue to manifest in the descendants of the carriers.Ê
List 5 reason person my be susceptible
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Tuberculosis is on the increase due to certain factors: An increase in HIV, makes the person susceptible to diseases especially to TB; people living in poor sanitation areas are infected by TB, as it thrives most in these areas; the most populated areas is where this disease is most prevalent. These factors help in the spread of TB.
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Immune is an adjective, i.e. your immune system. However, it can be used as a noun in the specific case of talking about a person who is not susceptible to a particular disease.
Genes like ApoE4 and other factors are the primary causes for the disease of Alzheimers to develop in a person's body.
Glucocorticoids can make a person susceptible to infection when they are administered for too long as a drug.
A carrier is a person who harbors a disease. They can spread viruses through various forms of contact with other people. Diseases continue to manifest in the descendants of the carriers.Ê