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Cases of co-infections due to the lungworm Aelurostrongylus abstrusus and feline immunodeficiency virus (FIV) in three cats are described. During 2017, 44 cats infected with FIV and 11 with A. abstrusus were presented to the Small Animal Clinic, Trakia University. And three of them were lethargic, anorexic and with pale mucous membranes, dyspnea, coughing and nasal discharge. No changes were observed in blood count. Parasitological and serological examinations were carried out. The larvae from the stool were identified as belonging to A. abstrusus and antibodies against FIV were detected as well. Radiographic findings included a generalized bronchointerstitioalveolar pattern and bronchial wall thickening. A proper medication with endectocide, antibiotics and fluids was prescribed. The effect of treatment was satisfactory and improvement of the general condition was observed