The Health Officer shall have such powers as may be necessary or useful to carry out and effectuate the purposes and provisions of this subchapter including (without limiting the generality of the foregoing) the following powers:
(A) To investigate conditions anywhere in the city in order to determine whether or not such conditions are, or are not, conducive to the existence or spread of endemic typhus fever or constitute a violation of this subchapter, and for this purpose, he may enter upon and within premises, dwellings and buildings of all sorts for the purpose of making examinations and investigations, provided that such entry shall be made in such manner as to cause the least possible inconvenience to the persons in possession; in the case of vacant dwellings or buildings where, after due diligence, he is unable to get in touch with the agent, owner or occupant thereof, he is authorized, for the purpose of making such examination and investigations, to enter forcibly.
(B) The Health Officer shall fix the duties of such officers, agents and employees as he deems necessary to carry out the purpose of this subchapter, to delegate any of his functions and powers under this subchapter to such officers and agents as he may designate.
('70 Code, § 11-19)