Do the potential health harms caused by cats, including toxoplasmosis and recurrent miscarriage, justify killing them, and is it permissible to kill a neighbor's cat for the same reason?

It is not permissible to kill cats unless they cause harm that cannot be removed except by killing. If studies prove their harm to pregnant women, it is possible to avoid them through means other than killing. Therefore, it is not permissible to kill a neighbor's cat as long as there is another way to avoid its harm.