7 Factors Why Mosquitoes Bite Some People More than Others May 18 2023

Mosquitoes are a ubiquitous part of summer and can quickly turn a relaxing evening into an itchy nightmare. However, it seems that mosquitoes are not equal-opportunity biters. Some people are seemingly immune to their bites, while others are constantly swatting them away. 

The reasons behind this difference are complex and multifaceted, involving genetics, body chemistry, and even the color of clothing worn. 

In this article, we will explore the factors that determine why mosquitoes bite some people more than others, so you can better protect yourself from these pesky insects.

1. Genetics

Genetics may play a role in how attractive certain individuals are to mosquitoes. According to a study published in PLOS ONE, genetics account for 85% of our susceptibility to mosquito bites. The study found that people with type O blood were more attracted to mosquitoes than those with other blood types. 

Additionally, certain genetic markers were found to be associated with increased mosquito bite susceptibility.

2. Body Odor and Sweat

Mosquitoes are attracted to the carbon dioxide that people exhale when they breathe. However, they are also attracted to the scent of sweat and body odor. People who produce more sweat or have a higher body temperature may be more attractive to mosquitoes. 

Additionally, certain chemicals found in sweat, such as lactic acid, ammonia, and uric acid, can make some people more attractive to mosquitoes.

3. Skin Bacteria

The bacteria that live on our skin may also play a role in attracting mosquitoes. A study published in the journal PLOS ONE found that people with a higher diversity of skin bacteria were less attractive to mosquitoes than those with a lower diversity. The study suggests that certain bacteria on our skin may produce chemicals that repel mosquitoes.

4. Pregnancy

Pregnant women are more attractive to mosquitoes than non-pregnant women. The reason for this is not entirely clear, but it may be due to the increased body temperature, sweat, and carbon dioxide production that occurs during pregnancy. Additionally, pregnant women produce more progesterone, which may also make them more attractive to mosquitoes.

5. Clothing and Colors

The color of clothing and the type of fabric used may also attract mosquitoes. Mosquitoes are attracted to dark colors, particularly black and navy blue. Additionally, they are attracted to clothing made from synthetic materials, such as polyester. Wearing light-colored clothing made from natural materials, such as cotton, can help reduce the risk of mosquito bites.

6. Time of Day

Mosquitoes are most active at dawn and dusk. During these times, they are more likely to be looking for a blood meal. Additionally, mosquitoes are more active during the summer months when the weather is warm and humid. Avoiding outdoor activities during these times can help reduce the risk of mosquito bites.

7. Host Immune System 

When a mosquito bites a human, it injects saliva into the skin, which contains proteins that can trigger an immune response. People with a stronger immune response may experience a more intense reaction to mosquito bites, which could make them more attractive to mosquitoes.


There are several factors that determine why mosquitoes bite some people more than others. Genetics, body odor, skin bacteria, pregnancy, clothing and colors, the time of day, and host immune system all play a role. While it may be impossible to completely avoid mosquito bites, taking steps to reduce the risk can help make outdoor activities more enjoyable. 

Using insect repellent, wearing light-colored clothing, and avoiding outdoor activities during peak mosquito hours can all help reduce the risk of mosquito bites.

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