There are two important concepts to keep in mind about deworming. It is very difficult to prevent mother to kitten transmission and routine deworming is not adequate. Note: When cats are dewormed, this affects only worms in the intestinal tract. Kittens can be infected by drinking their mother's milk, though, due to the intrauterine cycle described above, the litter would probably already be infected.
If the host is a nursing mother, second stage larvae can migrate to the mammary gland instead of the lung after encysting. The second stage larvae make their way to the kitten’s lungs to develop into third stage larvae. If the host is pregnant, the larvae do not migrate to the lung after they encyst instead they come to the uterus and infect the unborn kittens. The worms are coughed up into the host's throat where they are swallowed thus entering the intestinal tract for the second time in their development. When they get to the upper airways, their presence generates coughing. A heavy infection can produce a serious pneumonia. They burrow into the small airways and travel upward towards the host's throat. When the time comes to move on, the larvae encyst and migrate to the host's lungs where they develop into third stage larvae. If the host is a cat, the larvae mostly encyst in the host's liver. STEP THREE : These second stage larvae can remain encysted happily for years.
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