Whipple's disease expert in the disease, applied novel diagnostic methods to stored tissue samples from Whipple's original patient, and demonstrated "T. whipplei" in these tissues. Whipple's disease Whipple's disease is a rare, systemic infectious disease caused by the bacterium "Tropheryma whipplei". First described by George Hoyt Whipple in 1907 and commonly considered a gastrointestinal disorder, Whipple's disease primarily causes malabsorption but may affect any part of the body including the heart, brain, joints, skin, lungs and the eyes. Weight loss, diarrhea, joint pain, and arthritis are common presenting symptoms, but the presentation can be highly variable and approximately 15% of patients do
Psittacine beak and feather disease in prevention. Every new bird that enters a pen with other birds should be quarantined first and be tested for BFDV. Birds which are known carriers should not be introduced into new pens, especially not if those contain young birds. Psittacine beak and feather disease Psittacine beak and feather disease (PBFD) is a viral disease affecting all Old World and New World parrots. The causative virus–"Beak and feather disease virus" (BFDV)—belongs to the taxonomic genus "Circovirus", family "Circoviridae". It attacks the feather follicles and the beak and claw matrices of the bird, causing progressive feather, claw and beak malformation and