Can antibiotics kill multiple infections at once?

I'm 16, and was prescribed prevacid about a month ago for what i suspected was a stomach ulcer, very gnawing stomach pains. And i'm still taking it now, i have about another month to go. But a week ago, i was prescribed zithromax antibiotics for my bronchitis, is it possible, that if i had H. pylori... show more I'm 16, and was prescribed prevacid about a month ago for what i suspected was a stomach ulcer, very gnawing stomach pains. And i'm still taking it now, i have about another month to go. But a week ago, i was prescribed zithromax antibiotics for my bronchitis, is it possible, that if i had H. pylori bacteria in my stomach causing an ulcer, that the zithromax killed it along with the bronchitis, which dissapeared right after the last dose?
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