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The researchers are currently working on building the full-length IgM, which will include fragments that are missing in the present study.

Only those who had a Chinese vaccine are eligible for waivers of the IgM anti-body blood test.

Those who received an inconclusive positive IgM antibody test can still obtain a health QR code if they’ve received a Chinese vaccine, according to the new guidelines.

None of the babies in this study were found to have immunoglobulin M, or IgM, antibodies, which are typically only detected soon after an infection, suggesting that the babies hadn’t been infected with the coronavirus.

Another concern, Dr. Theel said, is that IgM tests can also be very difficult to find.