Question

Which study performed earlier this century established that the fourteenth-century black plague was spread from rats to humans via fleas?

descriptive
epidemiological
experimental
observational

Answer 1

epidemiological

Step-by-step explanation:

• Epidemiological studies are the ones that are conducted on human populations to determine the cause of the disease and also to evaluate the protective factors against the disease in a given population.
• These studies aim to identify a disease in the population, identify when, where and how it occurred so as to identify a definite cause and then to look for ways to eradicate the disease from the population or to decrease its frequency.
• The epidemiological studies were conducted in 14th century to determine the cause of black plague which caused the death of millions and the death was termed as black death.
• The epidemiological studies led to the conclusion that the deaths were caused due to the transmission of the plague from rats to humans via fleas.