5.2.2 Yersinia Yersinia is a genus of heterotrophic bacteria with 11 recognized species, some of which cause disease in humans, and both pathogenic and non-pathogenic strains of Yersinia have been found in surface water and unchlorinated drinking-water (Lassen 1972; Caprioli et al. 1978; Cafferkey et al. 1993)..2.2 Yersinia Yersinia is a genus of heterotrophic bacteria with 11 recognized species, some of which cause disease in humans, and both pathogenic and non-pathogenic strains of Yersinia have been found in surface water and unchlorinated drinking-water (Lassen 1972; Caprioli et al. 1978; Cafferkey et al. 1993).
1 When a woman ovulates, the egg is able to be fertilized for 12-24 hours (1 day). 2  When sperm enters the woman's body, it remains alive and able to fertilize an egg for 1-5 days. 3  It takes emergency contraception from 12-24 hours to be effective (1 day).  Emergency contraception remains effective for at least 10 days.
1. Take emergency contraception as soon as possible. If youâve had unprotected sex and are concerned that you could get pregnant, take the morning after pill, which is also called emergency contraception, as soon as you can. In most cases, you can take the morning after pill up to five days following unprotected sex. The morning after pill may not have any cost, or a clinic may price it on a sliding scale for those that can't afford full price. 2  You will be asked about your income and insurance to determine your fee. 3  Most universities have a health center that may offer emergency contraception.