Thanks for taking the time to play the game and give us usefull feedback.
We’ve updated the UI with clearer symptom details, check it out if you have the time and it might help you. How I usually play it, is to protect my researchers by checking everyone in the bunker for fever, unusual eyes, or an elevated heart rate. No single symptom confirms infection: a high pulse could follow exercise, while unusual eyes may be tattoos or contact lenses. Compare multiple clues before deciding who to keep pr kill, especially around the Research Lab.
When I Iose a lot of power or I stuck in antidote progress I try to get as many people as possible inside the bunker and try to kill only when needed because in late game the 5 power you lose in every kill is valuable. It's hard to balance it the first couple playthroughs.