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Sensitivity of Macrophages from Different Species to African Swine Fever (ASF) Virus

Centro de Biologia Molecular (C.S.I.C.-U.A.M.), Velázquez 144, Madrid-6, Spain

The swine white blood cells sensitive to African swine fever (ASF) virus are monocytes differentiated in vitro to macrophages. These cells have been characterized by their morphology, phagocytic capacity and the presence of receptors for swine immunoglobulin G in their membranes.

ASF virus does not produce any detectable effect on macrophages from humans, rabbits, guinea pigs, hamsters or rats, whereas ASF virus-infected chicken macrophages show an enhancement of cellular DNA synthesis and an intense cytopathic effect.

ASF virus, adapted to grow in VERO cells, produces a strong cytopathic effect in human macrophages leading to cell destruction. This effect is not associated with the synthesis of infectious virus, cellular or virus DNA nor with the formation of detectable virus-related structures.

Received 21 July 1976; accepted 27 September 1976.