Seasonal changes in the isolation rate of obligate anaerobes from the pathological material of patients with purulent inflammatory diseases were studied. For this purpose 707 samples of pathological material were analysed in the course of 1982-1986. Anaerobes were detected in 160 samples, which constituted 22.6% of all samples under study and 33.5% of the samples showing microbial growth. A statistically significant increase in the isolation rate of anaerobes from pathological material at the period of March-April was established. It was considered expedient to regard this newly found effect as an additional risk factor in the appearance of anaerobic infections and to take it into account in planning and carrying out prophylactic and diagnostico-therapeutic measures.
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