These diseases still posed a major threat, but now doctors could study them and develop science - based responses: Many cities in the U.S. and Europe established public health boards, improved sanitation and instituted quarantines at the first sign of disease spread. (discovermagazine.com)
The first signs of the disease are so - called drusen, which occur under the retina in the form of round, yellow deposits. (sciencedaily.com)
A decrease in your dog's energy levels may simply be a result of normal aging, but it can also be one of the first signs of disease, as the body struggles to fight viruses and infection. (lovinmypup.com)