WHEN IT’S GOOD TO WIPE OUT A SPECIES
The prospect of the deliberate extinction of some harmful species is getting closer. Be in no doubt - it would be an unambiguously good thing.
Smallpox was eradicated outside laboratories in 1977, when Ali Maow Maalin recovered from the disease in Merca, Somalia (he died last year of malaria). The last case of smallpox was the death of Janet Parker, a medical photographer, in Birmingham in 1978, who caught it from a laboratory.
If you had predicted in 1978 that 36 years later we would have extinguished no more diseases (apart from rinderpest, a cattle disease), you would have been thought a dire pessimist. Yet smallpox turned out to be uniquely vulnerable to eradication because its short incubation period, lack of an animal reservoir and its obvious symptoms allowed rapid vaccination responses to contain outbreaks.
Polio was expected to follow it to the viral grave soon afterwards, but that dream has been repeatedly postponed. Indeed, this year polio is resurgent, with 82 cases so far, compared with 34 by this date last year.
Most of them are in Pakistan, a country where polio vaccinators are sometimes murdered by the Taliban on the suspicion that they are US or Israeli agents spreading Aids or sterilizing girls.