Which plasmodium species cause Quartan fever?

Appeared in: RIMS Nursing Officer - 2022

Explanation

Quartan fever is characterized by fever spikes occurring every 72 hours (three-day interval).
This pattern is a hallmark of infection with Plasmodium malariae.
The 72-hour periodicity corresponds to the length of the parasite's asexual erythrocytic cycle, where infected red blood cells rupture in a synchronized manner.
The rupture releases merozoites and toxins, triggering the host's inflammatory response and causing fever.

Option A: Plasmodium vivax causes tertian malaria, not quartan. Its erythrocytic cycle is 48 hours, leading to fever every other day.
Option B: Plasmodium falciparum causes malignant tertian malaria. Its fever pattern is often irregular, continuous, or roughly every 48 hours, but not the distinct 72-hour cycle of quartan fever.
Option C: Plasmodium ovale causes tertian malaria, similar to P. vivax. Its erythrocytic cycle is approximately 48 hours, resulting in fever every other day.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Fever patterns in different Plasmodium species (Malaria) as background academic context rather than a clinical decision trigger.
Recognizing the classic fever patterns can provide an early clue to the infecting Plasmodium species, guiding initial diagnostic suspicion. However, fever patterns can be irregular, especially early in the infection or in mixed infections.
A nurse must prioritize obtaining a detailed travel history from any patient presenting with fever, as malaria is a key differential diagnosis for individuals returning from endemic areas.
Regardless of the suspected species, any patient with fever and a relevant travel history requires urgent evaluation with blood smears (thick and thin) or rapid diagnostic tests to confirm malaria and initiate treatment promptly.

How to Approach the Question

First, identify the key terms in the question: 'Quartan fever' and 'Plasmodium species'.
Recall the different types of fever patterns associated with malaria: tertian and quartan.
Associate 'quartan' with a 72-hour cycle (fever on day 1, then day 4).
Associate 'tertian' with a 48-hour cycle (fever on day 1, then day 3).
Match the 72-hour quartan cycle to the correct species, Plasmodium malariae.
Differentiate this from the 48-hour tertian cycle of P. vivax and P. ovale, and the often irregular pattern of P. falciparum.

Concept Tested & Keywords

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E6 Medicine Davidson Principles Practice 24e p. 294-296

E6 Medicine Harrison 22e Part 1 p. 1801-1803

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