JERUSALEM, July 13 (Xinhua) -- Israeli medical researchers have found differences between women and men in the levels of COVID-19 antibodies in the blood, Tel Aviv University (TAU) reported on Tuesday.

In a study, published in the preprint server Medrxiv, researchers from TAU and Shamir Medical Center in central Israel have found that in recovered women, the level of antibodies rises from the age of 51, and is higher compared to recovered men of similar ages.

This phenomenon may be related to change in levels of the estrogen hormone that affects the immune system, the researchers explained.

In recovered men, a rise in antibody levels is seen at an earlier age, starting around 35.

This may be related to changes in levels of the male sex hormone testosterone, and the effect on the immune system, the researchers said.

It was also found that the level of antibodies in the blood of vaccinated persons was four times higher than that found in convalescents.

In general, young adults were found to have a higher level of antibodies sustained for a longer period compared to older vaccinated persons.

In the study, the team examined antibody levels in over 26,000 blood samples.

The serological results indicated that besides age groups and gender, the level of antibodies also changes according to symptoms and time elapsed since vaccination. Enditem

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