Stability of Listeria monocytogenes in non-fat dry milk powder during isothermal treatment and storage.
The objectives of this study were to examine the stability of L. monocytogenes in non-fat dry milk (NFDM) during extended storage and further analyze thermal resistance of L. monocytogenes in NFDM under different water activities (aw) and its thermal stability after 1-year storage. We observed approximately 1.75 and 2.93 log CFU/g reduction of L. monocytogenes in aw 0.25 NFDM over 1-year storage at 4 and 22 °C, respectively. Thermal resistance of L. monocytogenes was inversely related to aw, and the inactivation kinetic curves of L. monocytogenes in NFDM at target aw showed a log-linear trend under all tested conditions. For aw 0.25, 0.30, and 0.45 NFDM, the ranges of D-values, were 66.2-21.3, 33.5-9.4, and 14.6-4.3 min at 70, 75 and 80 °C, respectively. The z-values for L. monocytogenes in NFDM at aw 0.25-0.45 were 14.6-16.0 C°. Furthermore, the thermal stability of L. monocytogenes in aw 0.25 NFDM post 6-month or 12-month storage under refrigerated or ambient temperature did not deviate much from that in NFDM prior to the storage. Data indicated that a 60-min heat treatment at 80 °C resulted in ~ 5-log reduction of L. monocytogenes in NFDM of aw 0.30. This provides a promising intervention strategy to enhance bactericidal efficacy of thermal treatment while maintaining the quality of milk powder. PMID: 31948617 [PubMed - in process]
In a beef cattle facility an outbreak of abortions occurred over a 36-day period and included samples from two aborted (non-viable) fetuses and 21 post-abortion clinical cases. There are numerous etiologies, i...
Publication date: Available online 8 February 2020Source: Food Research InternationalAuthor(s): Rafaela C. Baptista, Heber Rodrigues, Anderson S. Sant'AnaAbstractThe present work aimed to evaluate the frequency of seafood consumption by the Brazilian population, the safety practices during seafood handling and preservation as well as to evaluate the consumers’ perception on the risks associated with these foods. A total of 962 respondents responded to a survey divided into three parts: demographic and socio-economic profiles, seafood consumption habits, safety practices, and risk perceptions regarding seafood. The su...
The foodborne pathogen Listeria monocytogenes survives exposure to a variety of stresses including desiccation in the food industry. Strand-specific RNA sequencing was applied to analyze changes in the transcriptomes of two strains of L. monocytogenes (Lm 568 and Lm 08-5578) during desiccation [15°C, 43% relative humidity (RH)] on food grade stainless steel surfaces over 48 h to simulate a weekend with no food production. Both strains showed similar survival during desiccation with a 1.8–2 Log CFU/cm2 reduction after 48 h. Analysis of differentially expressed (DE) genes (>twofold, adjusted p-value
Almark's hard-boiled eggs are thought to be the culprits in an outbreak of listeria infections that have sickened seven and killed one. Now, it's expanded its recall to include ramen and breakfast kits.
by Craig Klugman, Ph.D. Last week, I received an automated phone call from my local grocery chain saying that I had purchased some hardboiled eggs that were part of a recall and I should return the eggs for a full refund. My initial reaction was that the call was a wonderful public health outreach program. The company that processed and distributed the eggs issued a recall after 7 people were infected with Listeria monocytogenes (4 were hospitalized; 1 died). A CDC investigation (https://www.cdc.gov/listeria/outbreaks/eggs-12-19/index.html) found that all of the infected patients had eaten hardboiled egg products from one ...
Veggie Noodle Co is the latest company to recall its product because it is made with hard-boiled eggs that have been implicated in a multi-state outbreak that has killed one and sickened six others.
Another food maker pulls products from stores in listeria outbreak that's led to one death and sickened four others.
A recall of hard-boiled eggs and egg salads linked to a deadly listeria outbreak has been expanded from Trader Joe's.
Almark Foods has expanded its recall of hard-boiled eggs to include products sold at grocery stores and major retailers nationwide, including Costco, Walmart, Kroger, and Trader Joes. The eggs may be tainted with Listeria bacteria. So far, 4 people have been hospitalized and 1 has died in the current outbreak.
The expanded recall follows a deadly listeria outbreak reported in five states.