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Summaries
January
The number of isolates (n=131) confirmed this month showed an increase in comparison to the number of isolates confirmed in January 2024 (n=83). Salmonella Typhimurium ST19 and Typhimurium ST568 (18.1% and 6.2% in 2024 vs 19% in 2024) were the most common serotypes confirmed this month.
February
The number of isolates (n=81) confirmed this month showed a decrease in comparison to the number of isolates confirmed in February 2024 (n=86). Salmonella Typhimurium ST19 (27.9% in 2024 vs 17.3% in 2025) was the most common serotype confirmed this month. Uncommon Salmonella serotype confirmed this month was S. Indiana (16 human isolates since it was first confirmed in New Zealand in 1990)
March
The number of isolates (n=83) confirmed this month showed a slight decrease in comparison to the number of isolates confirmed in March 2024 (n=87). Salmonella Typhimurium ST19 (13.8% in 2024 vs 25.3% in 2025) was the most common serotypes confirmed this month.
April
The number of isolates (n=74) confirmed this month showed an increase in comparison to the number of isolates confirmed in April 2024 (n=54). Salmonella Typhimurium ST19 (14.8% in April 2024 vs 18.9% in April 2025) was the most common type confirmed this month.
May
The number of isolates (n=95) confirmed this month showed an increase in comparison to the number of isolates confirmed in May 2024 (n=68). Salmonella Typhimurium ST19 (14.7% in May 2024 vs 14.7% in May 2025) was the most common type confirmed this month. Uncommon serotype confirmed this month was Salmonella Molade (2 human cases since it was first confirmed in New Zealand in 2009). Salmonella Cannstatt was confirmed for the first time in humans in New Zealand this month.
June
The number of isolates (n=54) confirmed this month is consistent with the number of isolates confirmed in June 2024. Salmonella Enteritidis ST11 (7.4% in June 2024 vs 14.8% in June 2025) was the most common serotype confirmed this month.
July
The total number of isolates (n=93) confirmed this month showed an increase in comparison to the number of isolates confirmed in July 2024 (n=40). Salmonella Typhimurium ST19 (1.5% in July 2024 vs. 14% in July 2025) was the most common serotype confirmed this month. Uncommon serotypes confirmed this month were Salmonella Ajiobo (2 human cases since it was first confirmed in New Zealand in 2009), Salmonella Carrau (2 human cases since it was first confirmed in New Zealand in 2019), and Salmonella Concord (4 human cases since it was first confirmed in New Zealand in 1999).
August
The number of isolates (n=75) confirmed this month showed an increase in comparison to the number of isolates confirmed in August 2024 (n=41). Salmonella Typhimurium ST568 (4.9% in August 2024 vs 20% in August 2025) was the most common strain confirmed this month. Uncommon serotypes confirmed this month were Salmonella Brunei (5 human cases since it was first confirmed in New Zealand in 1994) and Salmonella Richmond (17 human cases since it was first confirmed in New Zealand in 1989). Salmonella Vancouver was confirmed for the first time in humans in New Zealand this month.
September
The number of isolates (n=101) confirmed this month showed an increase in comparison to the number of isolates confirmed in September 2024 (n=49). Salmonella Typhimurium ST19 (12.2% in September 2024 vs. 24.8% in September 2025) was the most common strain confirmed this month.