The Concept of Pronicity in Otitis Media

Deficient IgA and IgG2 anti-pneumococcal antibody levels and response to vaccination in otitis prone children

OBJECTIVE

To evaluate the isotype and IgG subclass distribution of anti-pneumococcal antibodies and response to polysaccharide vaccination in otitis prone children.

METHODS

IgG1, IgG2 and IgA antibodies to pneumococcal serotypes 3, 4, 6B, 9V, 14, 19F and 23F were determined in otitis prone children and in an age-matched healthy control population. Patients were immunized with a 23-valent pneumococcal polysaccharide vaccine. The antibody response was measured 4 weeks later.

RESULTS

Geometric mean IgA and IgG2 antibody levels for all seven pneumococcal serotypes tested were significantly lower in otitis prone children than in the control population. After immunization, there was no significant increase in geometric mean IgG2 anti-serotype 6B, 19F and 23F pneumococcal polysaccharide (weak immunogenic), but also no increase for IgG2 anti-serotype 4 and 14. Post immunization IgG2 antibody titers for serotypes 6B, 9V and 19F even remained below titers of non-vaccinated controls. Nine out of 29 otitis prone children were colonized nasopharyngeally with Streptococcus pneumoniae during the time of vaccination; these children had an even more severely impaired systemic antibody response.

CONCLUSIONS

Otitis prone children, while having normal IgG1 antibody levels, have low IgG2 and IgA anti-polysaccharide antibody levels and fail to respond in these subclasses upon vaccination with pneumococcal polysaccharide vaccine.

Complications of Acute Otitis Media and Sinusitis

Otitis media and sinusitis are clinically identifiable infections of the middle ear and sinuses. Both conditions should be regarded as dynamic processes with a clinical spectrum, which may extend from a self-limiting condition to a prolonged and sometimes complicated disease. With the advent of antibiotics, the natural course of these diseases has changed significantly. Severe complications once characterized by high mortality and morbidity have become rare. This has led to a generation of general practitioners, otolaryngologists, and pediatricians trained in an atmosphere of complacency in the treatment of otitis media and sinusitis. However, several recent publications report an increasing incidence of serious complications associated with otitis and sinusitis, probably due to rising antibiotic resistance. A high index of suspicion, based on clinical grounds, is therefore warranted. The ultimate goal in the approach of these conditions is pharmacotherapeutic management, resorting to surgery for the restoration of function rather than for the eradication of the infectious disease. As new information becomes available on the etiology, pathogenesis, and bacteriology of these conditions, new strategies are being used to improve treatment and to prevent complications. These measures should include a more appropriate choice of antibiotics, the determination of the role of adjuvant therapy and surgical procedures, and the development of new vaccines.