Question

Erythrocytic phase of Plasmodium vivax is completed in
(a)24hours
(b)72hours
(c)36hours
(d)48hours

Answer 1

Hint Plasmodium vivax is a parasite which is a human pathogen and causes malaria. It is widely distributed and is a cause of recurring malaria. It is less virulent than its other species which are deadliest.

Complete answer:
The erythrocytic phase of Plasmodium vivax is completed in 48 hours. The central stage for sexual development of malarial parasites is red blood cells where the repeated cycles of parasitic development occur with periodicity and produce hundreds of fresh daughter parasites that are released at the end of each cycle which invade the number of red cells. The liver releases merozoites which enter the red blood cell by receptor-ligand interactions in less than 60 seconds. The circulation into the red cells minimizes exposure of the antigens on the surface of the parasite which protects them from the host immune response. The merozoites are facilitated by molecular interactions between the ligands on the merozoite. Micronemes involve the attachment, invasion, and establishment of merozoites into the red cells which are specialized by the ethical secretory organelles of merozoites. The interaction that leads to the formation of a stable parasite-host cell junction occurs in the parasite and the red cell starts stimulating a rapid wave of the formation around the red cell membrane.

Additional information:
The number of parasites expands rapidly in the red cells with sustained cycling of the parasite population. They provide an immunological advantage to the growing parasite which lacks the biosynthetic pathway and intracellular organelles in the red cells which create obstacles for fast-growing intracellular parasites. These are overcome by the growing stages of several mechanisms. The restriction of nutrients to the abundant haemoglobin and by a dramatic expansion of the surface area of a tubulovesicular network and by the export of a range of remodeling and virulence factors in the red cells.

So, the correct answer is '48 hours'.

Note: The breeding of malaria is in warmer climates where there is humidity and rain. It exists in around 103 countries which affect 3.3 billion people and 90% of deaths occur due to malaria in sub-Saharan Africa. Malaria cannot be transferred with an infected person through any contact sexually or other.