Give me paper for the bacteria Gram positive Bacillus Megatherium. Introduction detailing the background, habitat, cell size/shape/arrangement, and potential pathogenic and/or clinical significance.

1 Introduction Serratia marcescens Background Serratia marcescens in a gram - negative, rod shaped microorganism ranging from 0.5 - 0.8 μm in diameter and 0.9 - 2 μm in length. It belongs to the family, Enterobacteriaceae, and can be isolated from soil, water, plants, and insects (Cristina et al., 2019) . In terms of colony morphology, Serratia marcescens is capable of producing a red pigment, prodigoisin, when incubated in temperatures up to 32C. Prodigoisin possesses antimicrobial properties and is thought to contribute to more efficient cellular proliferation in Serratia marcescens (Haddix & Shanks, 2018). Clinical significance Serratia marcescens is considered an opportunistic pathogen, often infecting individuals with weakened immune systems. In particular, this microorganism is responsible for nosocomial infections in neonatal intensive care units (NICUs). Nosocomial infections are defined as in fections acquired in a hospital setting ( Parker et al., 2016 ). According to Tavares - Carreon et al. (2023), Serratia marcescens , “[. . .] has been isolated from catheters, oxygenation devices, prefilled syringes, needles, parenteral solutions, milk - drawers, sinks, nails, and hands of health care workers ” (pg. 2). This organism is often visible as a red biofilm on bathroom surfaces (e.g. toilets, shower tiles) and has the potential to form aerosols, which can then be inhaled or settle on surfaces, such as bath towels (Gerba et al., 1975; Ikpa & Obganda, 2023 ). Commented [G1]: This is an example of a paraphrase. Commented [G2]: Et al. if 3 or more authors Commented [G3]: Example of a direct quote. Notice the inclusion of the ellipses if it is quoted after the first word of the sentence. Notice the quotation marks. Notice the inclusion of the page number Commented [G4]: Ampersand if two authors 2 References Cristina, M. L., Sartini, M., & Spagnolo, A. M. (2019). Serratia marcescens infections in neonatal intensive care units (NICUs). International journal of environmental research and public health , 16 (4), 610. Gerba, C. P., Wallis, C., & Melnick, J. L. (1975). Microbiological hazards of household toilets: droplet production and the fate of residual organisms. Applied microbiology , 30 (2), 229 - 237. Haddix, P. L., & Shanks, R. M. (2018). Prodigiosin pigment of Serratia marcescens is associated with increased biomass production. Archives of microbiology , 200 , 989 - 999. Ikpa, A., & Ogbonda, K. H. (2023). Enhancing Contact Tracing for Serratia marcescens Biofilm on High - Usage Body Towels in Rivers State Bathrooms. Journal of Healthcare and Biomedical Science , 1 (2), 1 - 10. Parker, N., Schneegurt, M., Thi Tu, A. H., Foster, B. M., & Lister, P. (2016). Microbiology (OpenStax) . OpenStax. Tavares - Carreon, F., De Anda - Mora, K., Rojas - Barrera, I. C., & Andrade, A. (2023). Serratia marcescens antibiotic resistance mechanisms of an opportunistic pathogen: a literature review. PeerJ , 11 , e14399.