Abou Gamra, E. M., F. A. el Shayed, T. A. Morsy, H. M. Hussein, and E. S. Shehata. 1991. The relation between Cimex lectularius antigen and bronchial asthma in Egypt. Journal of the Egyptian Society of Parasitology. 21(3): 735–746.
Groups of asthmatic and non-asthmatic individuals were tested for their sensitivity to several common inhaled antigens that cause allergic reactions including two extracts from bed bugs. The asthmatic group had more individuals with positive reactions to the bed bug extracts than the control group.
Jimenez-Diaz, C., and B. S. Cuenca. 1935. Asthma produced by susceptibility to unusual allergens. The Journal of Allergy. 6: 397–403.
Researchers describe patient cases where asthma was induced due to bed bugs, linseed, tobacco, or chicory.