CD79A and infection: Additionally, participants who were IgA antibody seropositive after infection had milder symptoms of shortness of breath (OR 0.81; 95% CI 0.7-0.95), brain fog (OR 0.68; 95% CI 0.55-0.83), impaired coordination (OR 0.66; 95% CI 0.50-0.86), and physical pain (OR 0.76; 95% CI 0.60-0.96; Figure 4).