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Viruses and Mycotoxins in Milk—Potential Public Health Problems?

Milk and Food Research, Robert A. Taft Sanitary Engineering Center, Cincinnati, Ohio

ABSTRACT

Virus-like particles in cows' milk. Four investigators have independently reported the presence of virus-like particles in the cytoplasm and at the cell membrane of lymph-node cells from cattle with lymphosarcoma. It has also been shown that lymph-node tissue culture from newborn calves in lymphosarcoma-free herds developed resistance to the virus of vesicular stomatitis when the calves were foster-nursed on cows with lymphosarcoma (6). Transmission of mouse leukemia to infant mice by mother's milk also has been demonstrated (8). These facts prompted two groups of investigators to examine cows' milk for particles resembling viruses. One group (7) reported finding five general types of particles by electron microscopy of cows' milk and listed evidence both for and against interpreting these particles as being viral. In the second investigation two types of particles were found, of which one resembled murine leukemia virus (4).

The data are based solely on results of electron microscope studies, and no conclusions should be attempted on the public health significance of these data at this time.