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"In a systematic review of the literature, German researchers explored the ability of infectious organisms to survive on inanimate surfaces.1 They found that most gram-positive bacteria, including vancomycin-resistant enterococcus (VRE), methicillin-resistant Staphylococcus aureus (MRSA), and Streptococcus pyogenes can survive for months on dry surfaces. "In general, there was no obvious difference in survival between multiresistant and susceptible strains of Staphylococcus aureus and Enterococcus spp.," the authors write. "Only in one study was such a difference suggested, but the susceptible strains revealed a very brief survival as such. Many gram-negative species, such as Acinetobacter spp., Escherichia coli, Klebsiella spp., Pseudomonas aeruginosa, Serratia marcescens, or Shigella spp. can survive on inanimate surfaces even for months. These species are found among the most frequent isolates from patients with nosocomial infections. A few others, such as Bordetella pertussis, Haemophilus influenzae, Proteus vulgaris, and Vibrio cholerae, however, persist only for days. Mycobacteria - including Mycobacterium tuberculosisand spore-forming bacteria, including Clostridium difficile- can also survive for many months on surfaces."
Well bacteria spreads... so as long as you don't clean it it will still be there
This is why it is important not only to regularly clean surfaces but door handles, taps, telephones, push-buttons, remote controls and any other commonly-handled or frequently-touched objects and areas.