1. Listeria monocytogenes
: It is a gram-positive bacterium, is an ubiquitous, intracellular pathogen that can be found in moist environments, soil, water, decaying vegetation and animals, and it can survive and even grow under refrigeration.
2. Listeriosis caused by Listeria monocytogenes is a foodborne illness and cause various problems in the body.
3. Listeria monocytogenes is associated mostly with dairy products and it can cause stillbirth.
Listeria monocytogenes is a gram positive bacteria and it is pathogenic to humans. It has ability to grow at low temperatures it can survive in human food stuff even kept at zero degree Celsius. Its infection in pregnant woman causes meningitis in the developing child. It can also affect brain, spinal-cord and blood.
All these features fall in the line of features mentioned in the question and thus the bacteria will be Listeria monocytogenes.
