A wild animal can pose serious a health threat since we have no way of knowing what diseases the animal may have been exposed to in its natural environment. (houstontx.gov)
That's what you should ask yourself every time he is sick, now that drug resistance has become one of our most serious health threats. (parents.com)
Ideally, we would have the immune system of our youth when we are older and facing more serious health threats. (stemcellimmuneregenerative.com)