A parasitic malady is a communicable disease caused or transmitted by a parasite. Several parasites don't cause diseases. Parasitic diseases will have an effect on all living organisms, as well as plants and mammals. The study of parasitic diseases is named parasitology.
Symptoms may mimic anemia or a hormone deficiency. Parasites are responsible for many ill health conditions including diarrhoea, gastrointestinal upset, vaginal irritation, joint pain, nervous diseases, immune dysfunction and chronic fatigue. Long term, undetected infestation can cause many systemic problems.
Upper respiratory tract infection classified as "influenza and influenza-like illness" were reported in 2012 in a total number of 1 460 037 cases. In comparison with 2011, it was an 26.2% increase of incidence, and as compared to the median of 2006-2010 of 286.1%. In 2012, with still the clear predominance of salmonellosis among intestinal bacterial infections.