There are multiple definitions:

1. immunofluorescent antibody titer(English)

   • HAART, HIV, RDT, SLA, VL
   • Immunology, Fluorescence, Parasitology
   • https://doi.org…ica.2016.09.026

2. indirect fluorescent antibody test(English)

   • may refer to C.burnetii (Q fever) phase I antigen
   • IIFAT
   • Microbiology, Immunology, Fluorescence
   • https://doi.org/10.5578/mb.68336