Answer:
B. Bubonic plagues
Explanation:
Bubonic plague is caused by Yersinia pestis. Rats, prairie dogs and squirrels are the pests that harbour the disease while fleas serve as vector, carrying the Yersinia pestis to humans.
The human victim either touches a dead infected rodent or is bitten by an infected flea. The bacteria invade the skin and are gobbled up by macrophages. They continue to reproduce intercellularly and within lymph nodes especially the inguinal nodes. The nodes swell like eggs and become hot, red and painful. Fever and headache sets in. Hemorrhages under the skin cause a blackish discoloration leading people to call bubonic plague the "Black Death."
Without treatment, death occurs within a few days. Treatment is with antibiotics such as streptomycin, doxycycline.
A 2-hour nap can also additionally make you sense groggy when you awaken and you would possibly have problem falling asleep at night.
In general, the exceptional nap period for adults is set 20 mins and not than 30 mins. Sleeping for 20 mins permits the napper to get a chunk of mild sleep to reinforce alertness with out stepping into deep sleep. Waking up from deep sleep can motive grogginess and in fact get worse sleepiness. A 2-hour nap can also additionally make you sense groggy when you awaken and you would possibly have problem falling asleep at night. Aim for drowsing as much as ninety mins, 120-mins if necessary. Napping each day for two hours will be a signal of sleep deprivation and ought to be mentioned with a doctor.
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