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Year : 1988  |  Volume : 6  |  Issue : 4  |  Page : 241-250

Vi-Phage Types Of S. Typhi Isolated In Various Regions OF India 1982-87

Correspondence Address:
K Parkash

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7016 Strains of S. typhi received from various collaborating centers in India during the years. 1982-87 were subjected to phage typing. The order of frequency of predominant phage types in North and Central India was phage type A followed by El where as in South India instead of El phage type O was close to phage type A for the years 1982-86. However, in the year 1987 when there was decline in the out break of multi resistant S. typhi phage type O, in South India E1 acquired back the second position and the order of the predominant phage types become similar to North and Central India i.e. A, El and O. The increase in the UVS and Deg Vi strains specially in North India was observed. The regional phage types K1, and J1 of North India had shown sporadic isolation from Central and South India also. Intermingling of regional phage types primarily caused by population migration has been discussed. Phage types C 5 was almost confined to Central India. Certain exotic phage types of Middle East and North African countries and also some rare phage types were isolated from different regions of India. More diversity of phage types was seen in Northern India than in Central and South India. Some New phage types were introduced sporadically in between which were found self limiting, the details of which are described.

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