Most commonly, immunity: "a state of having sufficient biological defenses to avoid infection, disease, or other unwanted biological invasion." (Wikipedia). Immunity is naturally acquired (via exposure or maternally-transferred antibodies in utero) or artificially required through the use of vaccines.
Marek's Disease is a highly contagious viral disease among chickens. It is not transmittable to humans. Chickens with healthy immune systems can combat the virus and even though exposed, they do not have the disease themselves. So, YES, you can eat eggs from chickens who have been exposed to Marek's.
People can be exposed to chemicals on farms, in factories, and even in homes.
People can be exposed to chemicals on farms, in factories, and even in homes.
Yes. MCD can be blood-borne, and is a real concern if you have CJD (Cruetzfeldt-Jakobson Disease, human-equivalent to Mad Cow), so much so that you may not even be allowed to donate blood at all.
Broken teeth are subject to decay. Tooth decay is associated with other health problems such as heart disease and perhaps even cancer. An exposed nerve would be very uncomfortable. See a health clinic about getting your condition remedied.
Dengue Fever
Not a disease per say, the overconsumption of salt is often called the "silent killer".
Possibly. If you were exposed to chlamydia, you should get tested, even if you were on antibiotics at the time.
Yes; even if it weren't registered (which it is), it would be protected by common law.
Oxidation is mostly what occurs and rust is the by product but,this can take decades and even centuries
If by protected class you mean the same as not being able to discriminate against a worker the same as for sex, religion, etc., then no, it is not a protected class.Realistically, in many jobs there would be no discrimination involved in a decision to hire or let someone with rheumatoid arthritis go. If left untreated, and possibly even if treated, RA is a degenerative disease that can deform the hands or feet especially to such a degree as to make it impossible to do some kinds, or even any kind of work.
No, there isn't. But there is a preventative medication one can take while in malaria-infested areas to keep the disease from taking hold even if one would get exposed to it.