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In vitro antibacterial activity of BL-S640 was compared to that of cephalothin and cephalexin against Gram-negative and Gram-positive bacteria isolated from clinical specimens. BL-S640 demonstrated the best activity on nearly all microbial species studied, except for Haemophilus influenzae and Diplococcus pneumoniae against which cephalothin was slightly more active.
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Yourassowsky et al. (1975) studied this question.
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