Authors / Year Studied immune factors Conclusion
1)Veltri RW et al (1972) Salivary IgA Tonsillectomy does not modify host's salivary IgA
2) Ostergaard PA (1977) Salivary IgA, IgG, IgM No effect of tonsillectomy on salivary IgA level Significant decrease in salivary IgG
3)D'Amelio R et al (1982) Salivary IgA No negative effect of  tonsillectomy on salivary IgA
4)Cantani A et al(1986) Salivary IgA Recommend measuring salivary IgA level before and after tonsillectomy
5)Lenander-Lumikari M et al (1992) Salivary IgA, IgG, and IgM; salivary anti-microbial proteins lactoferrin, salivary peroxidase, myelo-peroxidase; antibodies against viral antigens and streptococcus mutans Tonsillectomy does not impair the antimicrobial capacity of human saliva
6)Del Rio-Navarro BE et al (1995) Salivary IgA No negative effect of tonsillectomy on salivary IgA
7) Kirstila V et al (1996) Salivary Ig’s (IgA, IgG, and IgM),anti-Streptococcus mutans,anti-viral Ig’s, lysozyme, lactoferrin, peroxidases, thiocyanate,hypothiocyanate, agglutinin Tonsillectomy does not notably impair the saliva-mediated host defence mechanisms. Some concerns were raised regarding some decrease in some immune factors.
8) Jung KY et al (1996) Salivary IgA No significant changes in the local immune system after tonsillectomy
9) Childers NK et al (2001) Salivary IgA, Ag-specific salivary IgA in whole and parotid specific saliva Tonsillectomy does not decrease the salivary IgA level.  The increase in parotid saliva specific IgA needs to be explored
Table 1: Reviewed studies and their conclusions.