What is the singular of bacteria?

Well, by some definition there are bacteria you could define as being a Bactrian, but I guess that’s not quite what the question meant.

Player #25874027, Bactrian camels have 2 humps, like the letter B. Dromedary camels have one, like a capital D! Easy peasy way to remember!

Bactrian camels are two cylinder Harley Davidson camels. With their 4 stroke humps they develope commendable torque, and are quite fast and reliable going across the desert.

Wombat, Bactrians are camels. Can never remember if Bactrians have two humps and Dromedaries one hump , or vice versa.