?(   54   )
After the attacks of fever have gone on for some time, sexual forms of
the parasite which, in the case of the Benign 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 fever except in the circumstances
when parthenogenesis occurs.
2. Quartan infection.-The symptoms produced by an infection with the
Quartan form of the malaria parasite are similar to those produced by the
Benign 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 result of an infection with Quartan parasites.
CHART No. II.
Malarial fever.    Quartan infection.                Name.-Chetty.    Age.-10 years.