[Crista galli pnevmatization: prevalence and clinical significance].

Objective: Determine the frequency of (crest of the rooster) pneumatization and the presence of communication of the pneumatized with the paranasal sinuses.

Material And Methods: Computed tomography data of the paranasal sinuses of 251 patients. The patients' age ranged from 23 to 70 years.

Controlled field trial with dried sorbed paratyphoid B and typhoid vaccines.

In 1968-70 a field trial was arranged in the USSR to evaluate the effectiveness of dried sorbed paratyphoid B and typhoid vaccines when administered in two doses separated by an interval of 20-30 days.TWO GROUPS OF SCHOOLCHILDREN WERE UNDER OBSERVATION: a group inoculated with paratyphoid B vaccine (75 805 children) and a group inoculated with typhoid vaccine (76 314 children). The persons who were inoculated with the paratyphoid B vaccine formed the control group used in evaluating the effectiveness of the typhoid vaccine, and those inoculated with the typhoid vaccine formed the control group for the evaluation of the paratyphoid vaccine.