Table 4 Comparison of total IgG levels in secretions and different mucosal compartments by severity of prior disease, µg/mL.

From: Mucosal immunity in health care workers’ respiratory tracts in the post-COVID-19 period

Group sample type

Severe disease

Moderate-to-severe disease

Mild/asymptomatic disease

No history of COVID-19

Oropharynx

0.012 (0.008; 0.101)

0.014 (0.009; 0.0154)

0.009 (0.007; 0.068)

0.008 (0.007; 0.034)

Nasopharynx

0.040 (0.018; 0.259)*

0.023 (0.009; 0.084)**

0.208 (0.047; 0.366)

0.115 (0.027; 0.175)

Induced sputum

0.082 (0.057; 0.209)**

0.096 (0.069; 0.139)**

0.078 (0.042; 0.097) *

0.018 (0.005; 0.057)

Salivary gland secretions

0.182 (0.107; 0.640)*

0.079 (0.012; 0.168)

0.070 (0.025; 0.135)

0.053 (0.018; 0.1240)

  1. Me (Q1; Q3) *p < 0.05 compared to the control group
  2. **p < 0.005 compared to the control group.