Yersinia pestis: The bacteria that causes the bubonic plague which in the year 541 (as the Black Death) and later in the Middle Ages decimated Europe. The effects of the plague are described in the nursery rhyme We all fall down.. Y. pestis mainly infects rats and other rodents which are the prime reservoir for the bacteria. Fleas are the prime vectors carrying the bacteria from one species to another. They bite rodents infected with Y. pestis, then they bite people and so transmit the disease to them. Transmission of the plague to people can also occur from eating infected animals such as squirrels. Once someone has the plague, they can transmit it to another person via aerosol droplets.
Other symptoms of reactive arthritis include: 1  feeling unusually tired (fatigue). 2  mild fever (a high temperature between 37-38Â°C or 98.6-101.0Â°F). 3  mouth ulcers. 4  painless white rashes inside your mouth. 5  a skin rash. 6  your nails can become thick and crumbly.
The specific cause of rheumatoid arthritis has yet to be identified despite decades of medical research. While we donât know specifically what causes rheumatoid arthritis, we do know that it is the result of an autoimmune disorder. An autoimmune disorder occurs when immune cells begin to attack the body. In the case of rheumatoid arthritis, the body attacks its own healthy joint tissue called the synovium. The synovium is what produces a clear liquid substance known as synovial fluid. This fluid lubricates healthy joints and gives cartilage and bones the nourishment required to remain effective and mobile.