a. In order to detect the occurrence or imminent threat of an occurrence of a public health emergency as defined in this act, the commissioner may take reasonable steps to investigate any incident or imminent threat of any human disease or health condition. Such investigation may include, and the commissioner may issue and enforce orders requiring, information from any health care provider or other person affected by, or having information related to, the incident or threat, inspections of buildings and conveyances and their contents, laboratory analysis of samples collected during the course of such inspection, and where the commissioner has reasonable grounds to believe a public health emergency exists, requiring a physical examination or the provision of specimens of body secretions, excretions, fluids and discharge for laboratory examination of any person suspected of having a disease or health condition that necessitates an investigation under this subsection, except where such action would be reasonably likely to lead to serious harm to the affected person. In instances involving an overlap agent or toxin, the Department of Agriculture shall be the lead agency with respect to surveillance, testing, sampling, detection and investigation related to animals, plants or crops under the jurisdiction of the Department of Agriculture pursuant to the provisions of Title 4 of the Revised Statutes, and shall coordinate its activities with all appropriate local, State and federal agencies.