#1 Not all of the parasites, they are still being discovered and named. #2 Even different samples from one person sent to same lab on the same day will be inconsistent (positive in one sample, negative in another). #3 Some parasites hide so effectively, we do not have the means in ascertaining their presence. Considering all this, and the fact parasites can lay eggs dormant for a while and we can get new parasites so easily, it's just a constant battle with maintenance mode.
Are we able to be tested for parasites?
#1 Not all of the parasites, they are still being discovered and named. #2 Even different samples from one person sent to same lab on the same day will be inconsistent (positive in one sample, negative in another). #3 Some parasites hide so effectively, we do not have the means in ascertaining their presence. Considering all this, and the fact parasites can lay eggs dormant for a while and we can get new parasites so easily, it's just a constant battle with maintenance mode.