Bubonic plague, a bacterial infection that causes the lymph nodes to swell, is painful called lymphadenopathy. The disease has long been thought to have caused Black death, killing one-third or more of Europe's population in the middle of the 14th century.
In modern times, plague continues to attack people around the world. Here are the perpetrators who have caused and spread this deadly disease.
Fleas are the medium that is responsible for most of the plague deaths in the modern world.Fleas receive bacteria that cause infection from dead mice. Then it spreads quickly when parasitic hosts.
Recent research shows that fleas spread bacteria that cause plague very quickly. It can spread disease for at least 4 days.
Like fleas, black rats are part of the plague spread. Black mice are also susceptible to plague and easily transmitted to humans.
Black rats were trapped on a ship in an Indonesian seaport during the epidemic in 1969. In 2003, nine countries reported 2,118 cases and 182 deaths. Of which 98% of cases and deaths were reported from Africa, according to the World Health Organization.
The bug must also be responsible for the transmission of Yersinia pestis, which causes plague. Genetic research has shown that this aphid grows in or around China more than 2,600 years ago and spread according to humans worldwide.
People with plague can also infect each other. Bubonic plague has the most common pathological characteristics that are painful, swollen lymph nodes. After a 2-6 day incubation period, symptoms appear, including severe malaise, headache, chills and fever. Plague can also be transmitted through blood or lungs. The second form, pneumonic plague, can be transmitted one person to another.
The culprit behind the plague is the bacteria Yersinia pestis in the blood. Its cells are small and pin-shaped. It kills 50-90% of untreated victims, and about 15% of those diagnosed and treated.
When spread to the North American continent via waterways, wild rodents and fleas are also infected. Consequently, squirrels were killed by the disease.