?( 30 )
After the attacks of fever have gone on for a few days, sexual
forms of the parasite which, in the case of the simple Tertian
parasite, are spherical in shape, will be seen in the blood as well
as the asexual sporulating forms. These sexual forms, however, do
not cause any symptoms, and unless they are taken into the body of a
suitable mosquito they gradually degenerate and die.
2. Quartan infection.-The symptoms produced by an infec-
tion with the Quartan form of the malaria parasite are similar to
those produced by the simple Tertian form, except that the interval
between the onset of the attacks of fever is one of 72 hours instead
of 48 hours. The reason of this is that the Quartan parasite takes
72 hours to complete its asexual cycle instead of only 48 hours as is
the case with the Tertian parasite.
Chart II illustrates the results of an infection with Quartan
parasites.
CHART No. II.
Malarial fever.    Quartan infection.
Name.-Chetty.   Age,-10 years.