The Russian authorities have taken all 17 people with whom he had contact into quarantine. Marmot hunting is banned here because of the threat of the plague, but the restrictions are widely ignored. Marmots are like large squirrels. Bubonic plague was the cause of the Black Death that swept through Asia, Europe, and Africa in the 14th century, killing an estimated 50 million people. Bubonic plague is a bacterial infection. First symptoms are fever, headaches, and vomiting. After, swollen and painful lymph nodes occur in the area closest to where the bacteria entered the skin. Several antibiotics are effective for treatment. Without treatment it results in the death of 30% to 90% of those infected. Death typically occurs within ten days.