Escherichia coli infections procedures

Figure 4. The technique of serial transfer. An RNA sample which is capable of replication in the assay is transferred into a test-tube containing stock solution. This medium contains the four nucleoside triphosphates (ATP, UTP, GTP and CTPJand a virus specific RNA polymerase, commonly QP-replicase because of the stability of this protein, in a suitable buffer solution. RNA replication starts instantaneously. After a given period of time a small sample is transferred to the next test-tube and this procedure is repeated about one hundred times. The transfer has two consequences (i) the material consumed in the replication is replaced, and (ii) the distribution of RNA variants is subjected to a constraint selecting for the fastest replicating species. Indeed, the rate of replication is increased by several orders of magnitude in serial transfer experiments starting out from natural QB RNA and leading to variants that are exclusively suited for fast replication and hence are unable to infect their natural hosts, Escherichia coli.

Lomefloxacin, a fluoroquinolone broad-spectrum antibiotic (400 mg p.o. daily for 10 to 14 days), is used in acute bacterial exacerbations of chronic bronchitis caused by Haemophilis influenzae or Moraxella (Branhamella) catarrhalis in uncomphcated urinary tract infections (cystitis) caused by Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, or Staphylococcus saprophyticus, in complicated urinary tract infections caused by E. coli, K. pneumoniae, P. mirabilis, and Pseudomonas aeruginosa and it is possibly effective against infections caused by Citrobacter diversus or Enterobacter cloacae and for the prophylaxis of infections after transurethral surgical procedures (see also Figure 85). 

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