A recent study conducted by the Department of Health Study has negated the use of allergy preventing mattresses quoting the reason of ineffectiveness. Mostly people use such covers on the mattresses that they have been using for a while. This leads to the growth of fungus, bacteria, and mould because the mattress acts as an incubator. Also whenever you remove the cover to wash it, all the contaminants get released into the air thereby infecting the air as well. And as per the manufacturer’s instructions you should wash the covers every week, which is a cumbersome task. We advise you to invest that money in professionally cleaning and getting your mattresses thoroughly cleaned and sanitized.