Yes, chlamydia get their ATP from the host cell.
Chlamydia derives energy from the ATP of the host cell.
Chlamydia can't make its own energy, so it uses ATP from the host cell.
Parasites get their energy and nutrition from their host. They cannot make their own energy, so they don't have chlorophyll.
Some parasites are prokaryotic (bacteria), and some are eukaryotic (helminths, protozoans...)
Humans aren't parasites because parasites are living things that suck the life out of another animal that it infected, called a host. Since humans get their energy from foods they eat and not energy they leeched from another living thing, they are not classified as parasites.
parasites
Parasites
Reticulate bodies are often termed "energy parasites" because they lack an enzyme system for producing ATP.
decomposers and parasites
parasites
Chlamydia trachomatis is the scientific name for the bacteria that causes chlamydia.
"Chlamydia probe" is a name for a chlamydia swab.