A. A few basic points to mention: you should use good quality, wide spectrum worming products, ideally from your vets. If your cats do have worms you should repeat the treatment after 3 weeks and then every 2-3 months. Also it is very important to limit exposure to eggs and larva by changing litter tray daily, remove cat's faeces from garden, wash cats' bedding and carpets at home etc. If this doesn't help you should take stool sample to your vet who should be able to identify the type of worms and prescribe worming medications.
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