Synopsis:
5. medicine & health: 1. diseases: Diseases: Infectious diseases: Typhus:
Nature 04781.txt
which was marked by high death rates from diseases such as smallpox, typhus and whooping cough. They investigated how crop yields around the time of birth affected people's survival and reproductive success during the famine.
ScienceDaily_2013 17985.txt
Others particularly mites and ticks can transmit diseases such as plague typhus or scabies. When the researchers compared their present-day maps with parasite distributions predicted for the future they found that lemur parasites could expand their range by as much as 60 percent.
ScienceDaily_2014 15756.txt
#Drought contributed to Typhus epidemics in Mexico from 1655 to 1918, study showsepidemiological data integrated with climate data taken from tree-ring estimates of soil moisture levels demonstrate that drought contributed to the spread of typhus in Mexico from 1655 to 1918 according to a new study by researchers
at the University of Arkansas. The study has modern-day policy implications because although typhus can be treated with modern antibiotics it remains a threat in remote impoverished areas of South america Asia
and Africa and could reemerge as a serious infectious disease especially where social strife and underdeveloped public health programs persist.
Historical records show that typhus has accompanied traditionally war famine and poverty said David Stahle a Distinguished Professor of geosciences.
Now because of Mexico's rich historical record of epidemic disease we can see that drought as reconstructed by tree-ring chronologies caused conditions that allowed typhus to flourish in central Mexico over a 250-year period.
Stahle and Jordan Burns a graduate student in geography at the U of A compared historical records of 22 typhus epidemics in central Mexico with soil moisture estimates based on tree-ring reconstructions.
Below-average tree growth drought and low crop yields occurred during 19 of the 22 typhus epidemics.
The observed relationship between drought and typhus epidemics in colonial and modern Mexico is curious
because drought has not been considered specifically a risk factor for typhus Burns said. But drought much like war and natural disasters caused famine in poor agricultural regions
Epidemic typhus is caused an infectious disease by a bacterium transmitted between people by body lice. The disease spreads where conditions are crowded and unsanitary.
< Back - Next >
Overtext Web Module V3.0 Alpha
Copyright Semantic-Knowledge, 1994-2011
