Table 5.

Observed number of individuals antibody-positive in different classes and analysis of the relationships between antibody classes and reported symptoms.

Classes of Antibodies	Classes of Antibodies
	IgA ${\mathit{n}}_{\mathit{I}}$ (+)	IgA ${\mathit{n}}_{\mathbf{II}}$ (+)	IgG ${\mathit{n}}_{\mathit{I}}$ (+)	IgG ${\mathit{n}}_{\mathbf{II}}$ (+)	IgM ${\mathit{n}}_{\mathit{I}}$ (+)	IgM ${\mathit{n}}_{\mathbf{II}}$ (+)
IgA $n_I$ (+)		14; p = 0.000	7; p = 0.000		1; p = 0.120
IgA $n_{II}$ (+)				10; p = 0.000		2; p = 0.108
IgG $n_I$ (+)				11; p = 0.000	0; p = 0.683
IgG $n_{II}$ (+)						1; p = 0.486
IgM $n_I$ (+)						3; p = 0.000
IgM $n_{II}$ (+)
Classes of antibodies	Symptoms
	low-/high-grade fever (+)	cough (+)	changes in smell and taste (+)	digestive system disorders (+)	respiratory infection (+)
IgA $n_I$ (+)	0; p = 0.602	0; p = 0.460	0; p = 0.672	1; p = 0.543	0; p = 0.548
IgA $n_{II}$ (+)
IgG $n_I$ (+)	0; p = 0.660	0; p = 0.545	0; p = 0.730	1; p = 0.300	0; p = 0.623
IgG $n_{II}$ (+)
IgM $n_I$ (+)	0; p = 0.855	0; p = 0.801	0; p = 0.886	0; p = 0.785	0; p = 0.838
IgM $n_{II}$ (+)