Detection of IgG and IgM Levels in Patients with COVID-19 in Mosul Province, Iraq

The pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-COV-2) has become the most dangerous viral infection worldwide. Since its identification in late 2019, the number of medical trials to combat the infection has sharply increased. Here, we investigated the profiles of IgG and IgM in 85 patients with confirmed SARS-CoV-2 infection from day 1 after symptom onset until day 35 with 5-day intervals. Serum samples were collected and stored until use. We observed that IgM levels were detectable on day 5 post symptom onset and increased sharply, with the highest rate detected in moderate cases (32.332 ± 4.32, n=10). Subsequently, a significant reduction in IgM was observed until it was undetectable on day 35 after symptom onset. Meanwhile, IgG levels were detected on day 10 post symptom onset, and the highest rate was observed in moderate cases (8.232 ± 2.3, n=10). A significant increase in IgG rate was observed in all patients, with the highest rate in moderate cases (42.432 ± 4.34, n=67) on day 35 post symptom onset. The statistical difference between the case and control groups was significant (p≤0.001). Two out of 85 patients died during the study.