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During the Middle ages, the plague came in waves. High population density areas were affected, entire convents and villages disappeared, some cities depopulated.
During the Middle ages, the plague came in waves. High population density areas were affected, entire convents and villages disappeared, some cities depopulated.
The widespread epidemics in the Middle Ages were originated by microorganisms that, at that time, were absolutely unknown. The spread of bacteria and viruses was mainly due to poor hygienic conditions and unhealthy homes. The most widespread epidemics in the Middle Ages were:
The widespread epidemics in the Middle Ages were originated by microorganisms that, at that time, were absolutely unknown. The spread of bacteria and viruses was mainly due to poor hygienic conditions and unhealthy homes. The most widespread epidemics in the Middle Ages were:
Plague (bubonic, colic, black, Justinian and children plague): Yersinia pestis
Plague (bubonic, colic, black, Justinian and children plague): Yersinia pestis
Leprosy: Mycobacterium leprae
Leprosy: Mycobacterium leprae
Smallpox: Variola major and Variola minor
Smallpox: Variola major and Variola minor
Ergotism: Claviceps purpurea
Ergotism: Claviceps purpurea
Cholera: Vibrio cholerae
Cholera: Vibrio cholerae
Typhus: Rickettsial species
Typhus: Rickettsial species
Diphtheria: Corynebacterium diphtheriae
Diphtheria: Corynebacterium diphtheriae
Polio: poliovirus
Polio: poliovirus
Tuberculosis: Mycobacterium tuberculosis
Tuberculosis: Mycobacterium tuberculosis
"Every infection is a race between the microbes and the host. The microbe, following the indelible rules of evolution, strives to survive and reproduce, while the host's immune system mounts a warlike defense designed to find, destroy, and eliminate it. An agent that kills its host quickly cannot be expected to survive long enough to reproduce. Thus excessive virulence is not selected for in evolution. Germs, which can reproduce and be passed from one host to another, are favored. " (http://uhavax.hartford.edu)
"Every infection is a race between the microbes and the host. The microbe, following the indelible rules of evolution, strives to survive and reproduce, while the host's immune system mounts a warlike defense designed to find, destroy, and eliminate it. An agent that kills its host quickly cannot be expected to survive long enough to reproduce. Thus excessive virulence is not selected for in evolution. Germs, which can reproduce and be passed from one host to another, are favored. " (http://uhavax.hartford.edu)
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