Some donors are non-anonymous, but most are anonymous, i.e. the donor conceived person does not know the true identity of the donor. Still, they may get the donor number from the fertility clinic. If that donor had donated before, then other donor conceived people with the same donor number are thus genetic half-siblings. In short, donor registries match people who type in the same donor number. Alternatively, if the donor number is not available, then known donor characteristics, e.g. hair, eye and skin color may be used in matching. Donors may also register, and therefore, donor registries may also match donors with their genetic children. The largest registry is the Donor Sibling Registry- with more than 25,000 members, the DSR has matched almost 7,000 donor conceived people with their egg and sperm donors, as well as with their half siblings. Alternate methods of providing an information link between the donor and recipient (both agreeing to stay registered on the DSR) are often provided for in the legal document (referred to as the "Egg Donor Agreement".) Embryo donation
An alternative to egg donation in some couples, especially those in whom the male partner cannot provide viable sperm, is embryo donation. Embryo donation is the use of embryos remaining after a couples IVF treatments have been completed, to another individual or couple, followed by the placement of those embryos into the recipient womans uterus, to facilitate pregnancy and childbirth. Embryo donation is more cost-effective than egg donation on a "per live birth" basis.
Pseudallescheria boydii is a species of fungus classified in the Ascomycota. It is associated with some forms of eumycetoma/maduromycosis and is the causative agent of pseudallescheriasis. Typically found in stagnant and polluted water, it has been implicated in the infection of immunocompromised and near-drowned pneumonia patients. Treatment of infections with P. boydii is complicated by  resistance to many of the standard antifungal agents normally used to treat infections by filamentous fungi.Pseudallescheria boydii fungal infection was the cause of death in three athletes submerged in the Yarkon River after a bridge collapsed during the 1997 Maccabiah Games. Taxonomy
The fungus was originally described by American mycologist Cornelius Lott Shear in 1922 as a species of Allescheria. Shear obtained cultures from a patient of the Medical Department of the University of Texas. The microbe was apparently associated with a penetrating thorn the patient had incurred in his ankle while running barefoot 12 years before. The diseased area was found to contain hyphae-containing granules that, when cultured, led to the growth of the organism. Shear considered the fungus most closely related to Eurotiopsis gayoni (now called Allescheria gayoni). The specific epithet boydii refers to Dr. Mark F. Boyd, who sent Lott the specimen. David Malloch moved the species to the newly created genus Petriellidium in 1970. The genus name of Petriellidium was in honour of Lionello Petri (1875-1946), who was an Italian botanist (Mycology) and Phytopathologist from Florence.