CD79A and COVID-19: Therefore, we analyzed these studies separately. Human milk COVID-19-specific antibodies have a weak positive relationship with subsequent vaccine dose (coefficient=0.65, P-value 0.62 for IgA and coefficient=0.3, P-value 0.84 for IgG) and time (coefficient=0.035, P-value 0.28 for IgA and coefficient=0.079, P-value 0.023 for IgG) (Table 4). There was significant heterogeneity among studies regarding all outcomes, with an I2 value exceeding 99% (P-value>0.0001).