Stop using all water in the building so nothing more drains into the affected area, keep people and pets out, and do not attempt extraction yourself. Sewage is Category 3 contaminated water, which requires protective equipment, containment, removal of porous materials, and disinfection. Photograph the area from the doorway, ventilate if you safely can, and call for professional sewage cleanup.
Yes. Sewage contains bacteria, viruses, and parasites along with chemical contaminants, and sewer gases such as hydrogen sulfide and methane can accumulate in enclosed spaces. Exposure routes include ingestion, contact with broken skin, and inhalation of aerosols. Restoration practice classifies it as Category 3 grossly contaminated water and requires protective equipment and containment.
Only in the narrowest case: a very small spill confined to a hard, non-porous surface, cleaned immediately with waterproof gloves, boots, eye and respiratory protection, followed by disinfection per CDC guidance. Anything that reached carpet, pad, drywall, cabinetry, or covers a meaningful area requires professional cleanup with containment, material removal, and verification.