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Late consequences of abortion.

Unfortunately, the morbidity and mortality associated with whooping cough have not been measured in today's circumstances, when most children are well nourished and hospital intensive care is readily available. General practitioners will, however, have seen enough whooping cough in the last few years to have formed their own assessment of its morbidity in their own communities. The massive National Childhood Encephalopathy Study investigation has shown that if all the 600 000 (normal) children born in Britain each year are immunised with pertussis vaccine two will have severe reactions with permanent disability. The balance between risks and benefits to the individual tips strongly in favour of the vaccine when acceptance rates are low and the disease is common; it tips the other way as vaccination rates climb and the disease declines.