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64
Mostly True unknown

People with O blood type are claimed to attract mosquitoes twice as much as those with A blood type, with B blood types attracting mosquitoes to a moderate degree.

The claim about blood type O attracting mosquitoes more than type A is backed by a Snopes fact-check rated 'Mostly True'. Various studies and sources suggest that mosquitoes show a preference for blood type O, while type B also seems moderately attractive to mosquitoes, though with some variation and dependency on other factors like heat and carbon dioxide emissions. Therefore, the claims about blood type affecting mosquito attraction have some scientific backing, but conclusions vary based on additional variables and different study outcomes.

May 23, 2026 Language: en 2 claims analyzed

Individual Claims

62
Mostly True Health
Having an O blood type makes you twice as likely to attract mosquitoes than people with A blood type.
Snopes rated similar claims as 'Mostly True', indicating scientific evidence suggests a preference by mosquitoes for blood type O over A. However, other factors such as carbon dioxide and body heat are also significant in mosquito attraction, which may dilute the claim's perceived impact.
Fact Check Score 51
Fact Check Weight 40
Web Consensus Score 70
Web Consensus Weight 30
Source Quality Score 65
Source Quality Weight 15
Llm Reasoning Score 70
Llm Reasoning Weight 15
Weighted Total 62
Evidence Summary 1 fact-check match (Snopes: Mostly True), several web sources indicate preference for blood type O.
65
Mostly True Health
B blood types fall in the middle of the spectrum for attracting mosquitoes.
Web sources suggest that mosquitoes do have a preference spectrum, with blood type B generally falling between O and A in attractiveness. However, the evidence varies and depends heavily on study conditions and other factors such as the individual's secretor status and environmental factors.
Fact Check Score None
Fact Check Weight 0
Web Consensus Score 70
Web Consensus Weight 50
Source Quality Score 60
Source Quality Weight 25
Llm Reasoning Score 60
Llm Reasoning Weight 25
Weighted Total 65
Evidence Summary Web evidence suggests type B is moderately attractive to mosquitoes, but evidence is not consistent.

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