At the higher levels of cautionary thoughtfulness to which it aspires, Warning Sign is debatable. Is the Government, despite denials, secretly working on weapons for biological warfare? If so, is there a clear and present danger that the bugs might get loose and start a devastating plague? But on a simpler level, this screenplay by Hal Barwood and Matthew Robbins, directed by the former, works very well as a hard-charging chiller. The nasty microbe in the lab turns people into murderous psychopaths when it infects them. And they, in turn, convert the facility into a kind of high-tech haunted...
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