Coronavirus antibodies may last only two to three months aft
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Coronavirus antibodies may last only two to three months after a person becomes infected with Covid-19, according to a new study published on 18 June 2020 in Nature Medicine.

• Researchers examined 37 asymptomatic people, those who never developed symptoms, in the Wanzhou District of China.

• Compared their antibody response to that of 37 people with symptoms and found people without symptoms had a weaker antibody response than those with symptoms.

• Within 8 weeks, 81% of asymptomatic people saw a reduction in neutralizing antibodies, compared with 62% of symptomatic patients.

• Additionally, antibodies fell to undetectable levels in 40% of asymptomatic people, compared with 12.9% of symptomatic people, according to the study’s findings.

• Results offer a strong note of caution against the idea of “immunity certificates” for people who have recovered from the illness, the authors suggested.

Scientists say they are still learning about key aspects of the virus, including how immune systems respond once a person is exposed.

Note: The complete study is attached as pdf.

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