Looks like they really did shut down the project. the second season in 2025 was the final one, like the person above already said correctly. the national geographic channel usually does this with documentaries - if the ratings aren't great, they don't drag the series out any further. the same thing happened with "hot zone," even though the first season was pretty interesting.
though sometimes channels do bring projects back after a while if there's a good reason or new material. but for that to happen there'd have to be either a new story about viruses or some sudden spike in audience interest. as of 2026 i haven't heard anything about it coming back, so it's probably really the end.
if you like that kind of content about diseases and epidemics, i can recommend documentaries from the same national geographic - there's always something interesting in that direction. honestly, i watch more stuff about bikes and nature, but my husband loves those science series, he's tried a ton of stuff))