Black Death did not kill indiscriminately, experts say

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Black Death did not kill indiscriminately, experts say

By Will Dunham Mon Jan 28, 5:16 PM ET

WASHINGTON (Reuters) - The Black Death that decimated populations in

Europe and elsewhere during the middle of the 14th century may not

have been a blindly indiscriminate killer, as some experts have believed.

An analysis of 490 skeletons from a London for Black Death victims

demonstrated that the infection did not affect everyone equally, two

U.S. scientists said on Monday.

While many perfectly healthy people certainly were cut down, those

already in poor health prior to the arrival of the plague were more

likely to have perished, they found.

" A lot of people have assumed that the Black Death killed

indiscriminately, just because it had such massive mortality, "

anthropologist Sharon DeWitte of the University at Albany in New York,

said in a telephone interview.

People already in poor health often are more vulnerable in epidemics.

" But there's been a tradition of thinking that the Black Death was

this unique case where no one was safe and if you were exposed to the

disease that was it. You had three to five days, and then you were

dead, " DeWitte said.

The plague epidemic of 1347 to 1351 was one of the deadliest recorded

in human history, killing about 75 million people, according to some

estimates, including more than a third of Europe's population.

DeWitte analyzed skeletons unearthed from the East field cemetery

in London, dug especially for plague victims and excavated in the

1980s, for bone and teeth abnormalities that would show that people

had health problems before they died of plague.

She found such abnormalities in many skeletons, suggesting these

people had experienced malnutrition, iron deficiencies and infections

well before succumbing to the Black Death.

The proportion of people with such signs of frailty in the cemetery,

compared to those who appeared to have been of robust health before

the epidemic, indicated that the infection was somewhat selective in

who it killed, DeWitte and Pennsylvania State University

anthropologist Wood reported in the Proceedings of the National

Academy of Sciences.

Some experts have thought the Black Death -- named after the black

spots the bubonic form of the plague caused on the skin -- killed

indiscriminately regardless of age, sex or level of health because it

was so virulent and the European population so immunologically

unprepared, DeWitte and Wood wrote.

" The Black Death was highly virulent and undoubtedly killed many

otherwise healthy people who would have been unlikely to die under

normal-mortality conditions, " they wrote. But people already in poor

health were more likely to die, they wrote.

Many scientists think the plague was caused by Yersinia pestis, a

bacterial disease spread by fleas from rats. It still kills between

100 and 200 people a year.

The Black Death pandemic thought to have begun in Asia, then spread

into the Middle East, Africa and Europe.

" On average, it killed between 30 to 50 percent of affected

populations. But we know that there were some areas where mortality

was even higher. So there would have been villages that were

completely wiped out, " DeWitte said.

Other experts now think the Black Death may have been caused not by

bubonic plague but by a viral hemorrhagic fever, similar to the

disease caused by the Ebola or dengue viruses.

http://news./s/nm/20080128/sc_nm/plague_europe_dc_1