Question

After how many hours does high fever typically appear in P. vivax infections?

Options

• Every 36 hours

• Every 48 hours

• Every 72 hours

• Irregular, between 22–48 hours

Answer 1

In P. vivax infections, the pattern of high fever occurs after every 48 hours (tertian fever). This regular two-day cycle is due to synchronized rupture of infected RBCs and is characteristic of this Plasmodium species.