<prompt> All of the following are true about Listeria except ?Transmitted by contaminated milkGram negative bacteriaCause aboion in pregnancyCauses meningitis in neonates  <response>: Ans. is b i.e., Gram negative bacteria Listeria mococytogenes Morphology . Gram positive . Coccobacillus with tendency to occur in chains. . Exhibits characteristic, slow, tumbling motility when grown at 25degC but at 37degC is non motile. This is because peritrichous flagella are produced by the bacillus optimally at 20-30degC but only scantily or not at all at 37degC. 