Swedish study reveals how long immunity lasts after mild COVID.

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In the wake of the ongoing pandemic of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and its associated disease, the coronavirus disease 2019 (COVID-19), global public health has never been in such peril.

As a result of SARS-CoV-2 infection, antibodies are produced against a range of viral antigens, including the spike and the nucleocapsid protein. There is evidence that antibodies to the spike-S1 protein, and more specifically, the receptor-binding domain, can neutralize the virus. There’s been research showing people who had severe infections staying protected from the virus for months. But not much is known about how long immunity lasts after a mild infection.

Research led by Asa Bjorndal from the Public Health Agency of Sweden investigated people’s antibody response after mild symptoms. The findings showed Immunoglobulin G (IgG) antibodies that target the spike protein remained stable after 8 months. But antibodies targeting SARS-CoV-2’s nucleocapsid protein waned over time.

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