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Titolo:
Bacteriophages: Update on application as models for viruses in water
Autore:
Grabow, WOK;
Indirizzi:
Univ Pretoria, Dept Med Virol, ZA-0001 Pretoria, South Africa Univ Pretoria Pretoria South Africa ZA-0001 -0001 Pretoria, South Africa
Titolo Testata:
WATER SA
fascicolo: 2, volume: 27, anno: 2001,
pagine: 251 - 268
SICI:
0378-4738(200104)27:2<251:BUOAAM>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
INFECTING BACTEROIDES-FRAGILIS; HEPATITIS-A VIRUS; ESCHERICHIA-COLI O157-H7; SEWAGE-POLLUTED WATERS; DRINKING-WATER; WASTE-WATER; LARGE VOLUMES; TAP WATER; RNA-BACTERIOPHAGES; MEMBRANE FILTERS;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
193
Recensione:
Indirizzi per estratti:
Indirizzo: Grabow, WOK Univ Pretoria, Dept Med Virol, POB 2034, ZA-0001 Pretoria, South Africa Univ Pretoria POB 2034 Pretoria South Africa ZA-0001 h Africa
Citazione:
W.O.K. Grabow, "Bacteriophages: Update on application as models for viruses in water", WATER SA, 27(2), 2001, pp. 251-268

Abstract

Phages are valuable models or surrogates for enteric viruses because they share many fundamental properties and features. Among these are structure, composition, morphology, size and site of replication. Even though they usedifferent host cells, coliphages and Bacteroides fragilis phages predominantly replicate in the gastro-intestinal tract of humans and warm-blooded animals where enteric viruses also replicate. A major advantage of phages is that, compared to viruses, they are detectable by simple, inexpensive and rapid techniques. In view of these features, phages are particularly useful as models to assess the behaviour and survival of enteric viruses in the environment, and as surrogates to assess the resistance of human viruses to water treatment and disinfection processes. Since there is no direct correlation between numbers of phages and viruses, phages cannot to a meaningful extent be used to indicate numbers of viruses in polluted water. The presence of phages typically associated with human and animal excreta indicates the potential presence of enteric viruses. However. the absence of these phages from water environments is generally a meaningful indication of the absence of enteric viruses. This is because phages such as somatic coliphages, F-RNA coliphages and B. fragilis phages generally outnumber enteric virusesin water environments, and they are at least as resistant to unfavourable conditions including those in water treatment and disinfection processes. However, using highly sensitive molecular techniques viruses have been detected in drinking water supplies which yielded negative results in conventional tests for phages. Initially, data on phages were rather confusing because a wide variety of techniques was used. However, techniques for the detection of phages are being standardised internationally. This applies in particular to somatic and F-RNA coliphages, and B. fragilis phages, which are most commonly used in water quality assessment. Reliable and practical techniques now available include direct quantitative plaque assays on samples of water up to 100 ml, and qualitative tests on 500 ml or more using highly sensitive enrichment procedures.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 01:51:32