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U.S. Department of Health and Human Services

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TITLE:  Bacteriophage-associated spherical bodies in Bacteroides fragilis
 
AUTHORS:  Silver RP;Chase DG;Tally FP;Gorbach SL;
 
YEAR:  1975
 
JOURNAL ABBREV:  J Virol
 
MONTH:  Apr
 
TYPE:  JOUR
 
REFMAN INDEX:  472
 
JOURNAL FULL:  Journal of virology
 
VOLUME:  15
 
ISSUE:  4
 
START PAGE:  894
 
END PAGE:  897
 
KEYWORDS:  Bacteriophages;Bacteroides;Inclusion Bodies,Viral;Microscopy,Electron;ultrastructure;
 
ABSTRACT:  Unique spherical bodies with multilayered walls were observed by electron microscopy in cells of a single strain of Bacteroides fragilis subsp. fragilis. Phage-like particles were present in the same cells, both free in the cytoplasm and within the spheres. The proportion of cells containing the phage-associated spherical structures ranged from less than 0.01% to about 7% depending on the culture conditions. Phage particles of morphological type B and spherical bodies were also found free in the medium surrounding the cells. Spherical bodies with discontinuities in their walls, through which phage-like particles sometimes appeared to be escaping, were also found both intra- and extracellularly. The biological significance of these distinctive spherical structures is a matter of conjecture
 
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