Bloody discharge samples can be collected from the sidewall for PCR testing of infectious laryngotracheitis virus (ILTV) in broilers. Such material often contains exfoliated epithelial cells, mucus, and blood originating from the trachea or conjunctiva of clinically affected birds, making it a practical and non‑invasive source of viral DNA. In houses experiencing acute ILT outbreaks, birds frequently shake their heads or cough up blood‑tinged mucus, which adheres to nearby surfaces such as walls, drinker lines, and even the clothing of caretakers. These deposits typically contain sufficient quantities of Gallid alphaherpesvirus‑1 (GaHV‑1) for reliable molecular detection.

From a diagnostic perspective, sidewall discharges are especially useful when handling live birds is difficult or when flock disturbance should be minimised. The material can be collected with a sterile swab, transferred into viral transport medium, or directly imprinted onto an FTA® card for stabilisation and shipment. Although such environmental samples are not a substitute for targeted sampling of tracheal or conjunctival tissues, they represent a valuable supplementary method that increases the likelihood of detecting the virus during the acute phase of infection.