Used to measure levels of interleukin-5 (IL-5) in biological samples from monkeys, such as serum, plasma, or cell culture supernatants. This kit is commonly applied in immunological research to study the role of IL-5 in eosinophil activation and regulation, particularly in models of allergic diseases like asthma. It supports the evaluation of immune responses in preclinical studies involving non-human primates, helping researchers assess the efficacy and mechanism of action of therapeutic compounds targeting type 2 inflammation. The assay enables sensitive and specific quantification, making it valuable for longitudinal studies and vaccine or drug development.