68 TROPICAL MEDICINE AND HYGIENE 



is complete recovery. The condition is quite different 

 from the still rarer optic neuritis due to malaria, as in 

 that condition the pupils react to light, the fundus is con- 

 gested, sometimes there are haemorrhages, and the disc 

 is swollen. 



Sequela. One result of successful prevention and treat- 

 ment of malaria is a diminished death-rate from all causes, 

 though no direct relation between some of these diseases 

 and malaria can always be traced. 



Tuberculosis and dysentery are specially prone to attack 

 persons who are much reduced by malarial diseases. 



Boils and other skin affections are very common, though 

 no special type of skin disease can be said to be a sequela. 



In individual instances there is no proof of lowered 

 resistance to other diseases, but taken in mass the evidence 

 is strongly in favour of malaria inducing a condition in 

 a proportion of the cases of increased susceptibility to 

 bacterial invasions. 



