Table 1. Isolation frequency of Shigella serotypes from patients admitted to two different hospitals, Kolkata, India.

Place, y, and period of sample collection	No. samples tested (n)	Strains Shigella isolated n (%)	S. dysenteriae (n)	S. flexneri (n)	S. boydii (n)	S. sonnei (n)
B.C. Roy Memorial Children’s Hospital
2001 Jan–April May–Aug Sept–Dec 2002 Jan–April May–Aug	1,069 442 397 230 790 365 425	80 (7.5) 26 (5.9) 39 (9.8) 15 (6.5) 72 (9.1) 32 (8.7) 40 (9.4)	5 1 4 0 5 1 4	40 13 17 10 45 26 19	9 3 5 1 4 1 3	26 9 13 4 18 4 14
Infectious Diseases Hospital
2002 July–Aug	77	27 (35)	24	2	0	1