Abstract
The application of guava leaves ectract to antimicrobial hns been done in village society, but it is not applied to salmonellosis yet. The research about the screening on some concentration of guava leaves extract to some species of salmonella has been caried out at the Laboratory of Microbiology and the research Inboratory Department of Pharmacy, Faculty of Mathematic and Natural Sciences Andalas University. This research used completely randomized design with nested pattern with three replication. The first factor was: Salmonella typhi, S. paratyphi A and S. paratyphi B. The secondfactor was concentration of guava leaves extract: 30Vo, 40Vo, 50Vo and 607o. The resulls of this research showed that the extract concentration 30-607o could inhibit all of the growth of bacteria. The best concentration of guava leaves extract inhibited the-bacterial growthwas 60Eo.
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