The Crazies. 1973.
A toxin called "Project Trixie" is released over a small town polluting the main water and turning those infected psychotic and the military are sent in to contain it.
This was George A. Romero's attempt on mixing a toxin virus and a battle of survival and is able to do it on a budget and it pays off well, with some decent acting. Do often think who is crazy, the towns people for trying to escape or the military giving out orders to contain and eliminate those infected with a so-called cure that may not even work or the right time to administer it. Right from the start we are basically thrown into the madness and paranoia on who to trust with some tense moments.
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