Microbiology: Current Research

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Commentary - Microbiology: Current Research (2023) Volume 7, Issue 2

Human evolution, migrations, and parasitic infections

Poul Henry*

Department of Zoology, University of Otago, Dunedin, New Zealand

*Corresponding Author:
Poul Henry
Department of Zoology
University of Otago
Dunedin, New Zealand
E-mail: henry.poul@otago.ac.nz

Received: 31-Mar-2023, Manuscript No. AAMCR-23-97332; Editor assigned: 03-Apr-2023, Pre QC No. AAMCR-23-97332(PQ); Reviewed: 17-Apr-2023, QC No. AAMCR-23-97332; Revised: 22-Apr-2023, Manuscript No. AAMCR-23-97332(R); Published: 29-Apr-2023, DOI: 10.35841/aamcr-7.2.145

Citation: Henry P. Human evolution, migrations, and parasitic infections. J Micro Curr Res. 2023;7(2):145

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Human evolution has been an ongoing process that has taken place over millions of years. Throughout this time, our ancestors have migrated across the globe, encountering different environments, and adapting to new circumstances. One aspect of human history that is often overlooked is the role of parasitic infections in shaping our evolution and migration patterns. Parasites are organisms that live on or within a host organism and feed on its resources. They can have a significant impact on the health and well-being of their host, causing a range of diseases and health problems. Humans have been dealing with parasitic infections since the earliest stages of our evolution. However, the relationship between humans and parasites is not one-sided. Parasites have also played a significant role in shaping our evolution [1].

The evolution of humans can be traced back millions of years to our primate ancestors, who lived in the forests of Africa. Over time, these primates evolved into hominins, which were bipedal (walking on two legs) and had larger brains. One key factor in the evolution of hominins was their diet. As they moved out of the forests and into the savannas, they began to consume more meat. This change in diet provided hominins with the necessary protein and nutrients to support the growth of their brains. However, the consumption of meat also brought with it the risk of parasitic infections. Many of the animals that hominins hunted and ate were infected with parasites, which could be transmitted to humans. In response to this threat, hominins developed a number of adaptations to protect themselves from parasitic infections. For example, they developed stronger immune systems, which allowed them to fight off infections more effectively [2].

Another key factor in the evolution of humans was our ability to migrate across the globe. Humans are the only species that has been able to migrate to every continent on the planet. This ability to migrate was essential for our survival as a species. As environments changed, humans were able to move to new areas where resources were more plentiful. This allowed us to thrive and spread across the globe. However, migration also brought with it the risk of encountering new parasites. As humans moved into new areas, they were exposed to new types of parasites that they had not encountered before. This could lead to outbreaks of disease and health problems. In response to this threat, humans developed a number of adaptations to protect themselves from parasitic infections [3].

One example of this is sickle cell anemia, a genetic disorder that affects the shape of red blood cells. Sickle cell anemia is most common in populations that are descended from people who lived in areas where malaria is prevalent, such as sub- Saharan Africa. People with sickle cell anemia are more resistant to malaria because the abnormal shape of their red blood cells makes it more difficult for the malaria parasite to infect them. This adaptation has provided a survival advantage to people living in areas where malaria is common [4].

Another example of an adaptation to parasitic infections is lactose tolerance. Lactose is a sugar that is found in milk. In most mammals, the ability to digest lactose decreases after weaning. However, some human populations have evolved the ability to digest lactose into adulthood. This adaptation is thought to have evolved in populations that relied heavily on dairy products for their diet. In areas where fresh water was scarce, people would often drink milk instead. This provided them with a source of hydration and nutrients. However, milk can also be a source of bacterial and parasitic infections. The ability to digest lactose into adulthood allowed these populations to consume dairy products without becoming sick [5].


Parasitic infections have played a significant role in shaping human evolution and migration patterns. As humans have evolved, we have developed a number of adaptations to protect ourselves from parasitic infections. These adaptations have allowed us to survive in different environments and to thrive as a species. However, as we continue to migrate and encounter new parasites, it is important to remain vigilant and continue to adapt to new threats.


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