1. The only diseases justifying measures restricting freedom of movement shall be the diseases with epidemic potential as defined by the relevant instruments of the World Health Organisation and other infectious diseases or contagious parasitic diseases if they are the subject of protection provisions applying to nationals of the host Member State.
2. Diseases occurring after a three-month period from the date of arrival shall not constitute grounds for expulsion from the territory.
3. Where there are serious indications that it is necessary, Member States may, within three months of the date of arrival, require persons entitled to the right of residence to undergo, free of charge, a medical examination to certify that they are not suffering from any of the conditions referred to in paragraph 1. Such medical examinations may not be required as a matter of routine.