Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 426669
Title Thermal stability of structurally different viruses with proven or potential relevance to food safety
Author(s) Tuladhar, E.; Bouwknegt, M.; Zwietering, M.H.; Koopmans, M.; Duizer, E.
Source Journal of Applied Microbiology 112 (2012)5. - ISSN 1364-5072 - p. 1050 - 1057.
Department(s) Food Microbiology
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) avian influenza-virus - murine norovirus - feline calicivirus - human parechovirus - inactivation - pcr - surface - heat - enteroviruses - disinfection
Abstract Aims: To collect comparative data on thermal stability of structurally different viruses with proven or potential relevance to food safety. Methods and Results: Suspensions with poliovirus Sabin1, adenovirus type5, parechovirus1, human norovirus (NoV) GII.4, murine NoV (MNV1) and human influenza A (H1N1) viruses were heated at 56 and 73°C. Infectivity was tested by culture assay for all but human NoV GII.4 that cannot be cultivated in vitro. Time to first log10 reduction (TFL-value) was calculated based on best fit using the monophasic, biphasic or Weibull models. The Weibull model provided the best fit at 56°C for all viruses except influenza virus. The TFL at 56°C varied between a high of 27 min (parechovirus) to a low of 10 s (adenovirus) and ranked parechovirus > influenza > MNV1 > poliovirus > adenovirus. The monophasic model best described the behaviour of the viruses at 73°C, in which case the TFL was MNV1(62s) > influenza > adenovirus > parechovirus > poliovirus(14s). Conclusions: Viruses do not follow log-linear thermal inactivation kinetics and the thermostability of parechovirus and influenza virus is similar to that of proven foodborne viruses. Significance and Impact of the Study: Resistant fractions of viruses may remain infectious in thermal inactivation processes and inactivation of newly discovered or enveloped viruses in thermal food preparation processes should not be assumed without further testing.
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