Cultivation of Plasmodium falciparum using animal serum (horse, calf and bovine) as human serum substitute.

This research study explores the use of horse, calf, and bovine serum as substitutes for human serum in the cultivation of Plasmodium falciparum, the parasite that causes malaria. The results show successful growth after gradual adaptation of the parasite to the substitute serums, with horse serum providing comparable or superior results to human serum.

Study Objective and Approach

• The objective of this research was to determine if animal serums, specifically from horses, calves, and cows, could be used as substitutes for human serum in the cultivation of Plasmodium falciparum.
• The parasites had to be gradually accustomed to the test serums before stable growth could be observed.
• Experimentation was conducted over a period of about 4-5 weeks in order to establish adapted lines in each type of serum.

Key Findings

• Of all the animal serum substitutes tested, 10% horse serum demonstrated the best results, with growth rates equivalent or even higher than those observed in human serum.
• While pure calf or bovine serum supported lower growth rates, about 20-30% less than in comparison to human serum, this could be improved to comparable levels with the addition of 1% glucose-peptone to the medium.
• Adapted cultures showed enhanced growth rates when transferred directly to human serum.
• Lower growth rates observed in cultures adapted to one type of substitute serum, but then transferred to another type of substitute serum, improved through subsequent subcultures.
• The parasites showed no adverse effects when returned to the original substitute serum they had been adapted to.

Implications of the Findings

• This study suggests that it is possible to use animal serum as a viable substitute for human serum in the cultivation of Plasmodium falciparum, provided that the parasite is gradually adapted to it.
• Among the tested serums, horse serum might be the most promising substitute, delivering comparable or even superior growth rates to human serum.
• This could potentially circumvent the need for human serum in the study of malaria, providing a more readily available and ethical alternative.
• The ability to enhance growth rates through supplementing the medium with glucose-peptone and the improvement seen in growth rates with subsequent subcultures suggests that the technique can be refined further to optimize growth.