1. Acton, J.D. and Myrvik, Q.N., 1966. Production of interferon by alveolar macrophages. J. Bacteriol. 91, 2300.
2. Allan, E.M., 1978. Pulmonary bacterial flora of pneumonic and non-pneumonic calves. In: Respiratory Diseases in Cattle (Ed. by W.B. Martin), p. 345. Martinus Nijhoff, The Hague.
3. Arend, W.P. and Mannik, M., 1973. The macrophage receptor for IgG: number and affinity of binding sites. J. Immunol. 110 1455.
4. Busse, W.W., Reed, C.E. and Hoehne, J.H., 1972. Where is the allergic reaction in ragweed asthma? II. Demonstration of ragweed antigen in airborne particles smaller than pollen. J. Allergy Clin. Immunol. 50, 289.
5. Cate, T.R., Douglas, R.G. Jr. and Couch, R.B., 1969. Interferon and resistance to upper respiratory virus illness. Proc. Soc. exp. Biol. Med. 133, 631.