Incidence of verminous bronchitis or pneumonia in Malaysia is an absolute rarity. Recently, lung samples obtained from a field post-mortem case unveiled evidence of this condition in an ox. Gross examination of the fresh unfixed chilled lungs received from Pejabat Veterinar Daerah Kerian, Perak revealed around 20-30 adult whitish worms of 3-5 cm in length and 0.1-0.2 mm in diameter in the bronchi of pneumonic areas. These worms were later identified as Dictyocaulus viviparous, a case which has been not diagnosed for the past few years. This finding indicated that the ox might have acquired the infection following exposure to heavy larval challenge. The use of anthelmintic may be helpful if it is given as an early prognosis for clinical condition of cough, and that dyspnoea and pyrexia are guarded. The management of grazing animals and pasture in Malaysia is very critical in preventing recurrence or occurrence of this condition.