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.
Reactive Arthritis Symptoms. Knee Pain. Pain can also occur in the knee from diseases or conditions that involve the knee joint, the soft tissues and bones surrounding the knee, or the nerves that supply sensation to the knee area.