Ana Moreno, etc.,al. [preprint]nactivation of Influenza A Viruses (H1N1, H5N1) During Grana-Type Raw Milk Cheesemaking: Implications for Foodborne Transmission Risk. https://doi.org/10.1101/2025.06.18.660327
Background: The detection of H5N1 highly pathogenic avian influenza virus (HPAIV) in lactating dairy cattle in the United States, with high viral titers in raw milk, has raised concerns about potential zoonotic transmission through the consumption of unpasteurized milk and raw-milk dairy products. While inactivation studies exist for pasteurized milk, data on virus persistence during the manufacture of raw-milk cheeses remain scarce. Aim: To evaluate the survival and inactivation of avian influenza viruses (AIV), including both low pathogenic (LPAIV, H1N1) and highly pathogenic (HPAIV, H5N1) strains, during the production and ripening of Grana-type hard cheeses made from raw bovine milk. Methods: Experimental cheesemaking was conducted using raw milk artificially contaminated with A-Duck-Italy-281904-2-06 (H1N1; 10 7,75 EID50 per mL) or A-Duck-Italy-326224-2-22 (H5N1 clade 2.3.4.4b; 10 6,75 EID50 per mL). Cheeses were produced in accordance with Parmigiano Reggiano production standards and ripened for 30 days at 5 or 6 degrees Celsius. Viral presence was assessed in finished cheeses by inoculation on SPF embryonated chicken eggs (ECE), hemagglutination (HA) assay, and monoclonal antibody-based ELISA. Results: No infectious virus was detected in any cheese sample produced from contaminated milk following two blind passages in SPF-ECE. Both HA and ELISA tests yielded negative results, indicating complete inactivation of the virus. Conclusion: This study demonstrates that the traditional Grana-type cheese production process, including curd cooking, acidification, and ripening, effectively inactivates both LPAIV and HPAIV, even at high contamination levels. These findings support the microbiological safety of hard cheeses made from raw milk with regard to AIV, contributing to risk assessment and food safety policies during avian influenza outbreaks.
See Also:
Latest articles in those days:
- [preprint]The mammalian-adaptive PB2-E627K substitution preserves viral fitness of clade 2.3.4.4b H5N1 HPAIV in birds 8 hours ago
- Mallard super-shedders of avian influenza exhibit distinct cloacal microbial abundance profiles 12 hours ago
- A digitally immune-optimized influenza vaccine broadly neutralizes swine and human H1N1 influenza viruses and protects from heterologous challenge 12 hours ago
- Associations between vaccine misinformation and influenza vaccine uptake: a population-based interrupted time-series study in China 13 hours ago
- Infection and transmission dynamics of bovine and human influenza A H5N1 viruses in mouse and hamster models 13 hours ago
[Go Top] [Close Window]


