If a justice of the peace (acting, if he deems it necessary, ex parte) is satisfied, on a written certificate issued by the medical officer of health of any district.—
(a) that there is reason to believe that one of a group of persons, though not suffering from a notifiable disease, is carrying an organism that is capable of causing it; and
(b) that in the interest of those persons or their families, or in the public interest, it is expedient that those persons should be medically examined ;
the justice may order them to be medically examined by the medical officer of health or by a registered medical practitioner nominated by him.
An order under this section may be combined with a warrant under section 287(2) of the Public Health Act 1936 authorising the medical officer of health to enter any premises.