|
The Language of the GenesIn a population which has never been exposed and which has no immunity, measles can have terrible effects. When it came to Fiji in 1875 (the result of a visit by the King to Sydney) it killed a third of his hundred and fifty thousand subjects. It soon disappeared from the island as it needs a community of at least half a million to persist. Measles may arrive in a place with fewer inhabitants, but cannot maintain itself. In Iceland before the Second World War there were gaps of up to seven years between epidemics. Only after 1945 (when constant movement meant that the Icelanders became part of the European population as a whole) did measles become a continuous problem. Humans have lived in groups of half a million or more for a mere two or three thousand years, so that measles must be a fairly new disease. Its initial impact was much worse than was its effect on populations who had lived with ii lor many generations. The constant change in the pattern of infection means that evolution can never rest: far from perfecting us, it is constantly faced with new challenges ...» |
Код для вставки книги в блог HTML
phpBB
текст
|
|
(499) 213 04 22
Счеты "Совята". 
Магнитный лабиринт "Домашние животные". 
Рюкзак для старших классов "Фантазия", 41x32x14 см. 
Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка 
