(a) Any municipal departments of health, pursuant to municipal charter or ordinance, and health districts may contract among themselves for the joint use or benefit of the municipality for services, personnel, facilities, equipment or any other property or resources for matters affecting public health. Any officer or employee of a municipality furnishing such services under such an agreement shall have, in the municipality or district to which the services are furnished, the same authority, responsibilities and duties as to public health as the officer or employee has in the municipality or district employing him.

(b) When necessary to protect and preserve the public health and prevent the spread of disease and injury, any municipal department of health, pursuant to any municipal charter or ordinance and with the approval of the chief executive officer of the municipality, or any health district may request emergency assistance and the use of resources from any other municipal department of health or health district. Any officer or employee of a municipality or health district, while acting in response to such a request, shall have, in the municipality or district to which the services are furnished, the same powers, duties, privileges and immunities as are conferred on public health officers and employees of the municipality or district requesting assistance.