Viruses that kill someone in less than a day seem scary, but aren’t much of a threat. They kill their own hosts too fast to spread. If you really want to custom-engineer a terrifying virus, give it a very short incubation period and a very long, non-symptomatic period where it’s contagious. People go about their daily lives for months, spreading it to everyone they meet, then die. Heck, make the non-symptomatic period longer than most quarantines, that oughta do it.
Also: no virus in the world could kill someone in less than a minute. Viruses rely on their host’s cells to reproduce, they cannot reproduce that fast. Nor can bacteria. That is not how pathogens work. Stop.