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Summaries
January
The number of isolates (n=110) confirmed this month showed a decrease in comparison to the number of isolates confirmed in January 2025 (n=131). Salmonella Typhimurium ST19 (19% in 2025 vs 34.5% in 2026) was the most common serotype confirmed this month.
February
The number of isolates (n=101) confirmed this month showed an increase in comparison to the number of isolates confirmed in February 2025 (n=81). Salmonella Typhimurium ST19 (17.3% in 2025 vs 22.8% in 2026) was the most common serotype confirmed this month.
Uncommon Salmonella serotypes confirmed this month were S. Goldcoast (5 human isolates since it was first confirmed in New Zealand in 1989) and S. Itami (6 human isolates since it was first confirmed in New Zealand in 2009)
March
The number of isolates (n=76) confirmed this month showed a slight increase in comparison to the number of isolates confirmed in March 2025 (n=83). Salmonella Typhimurium ST19 (25.3% in 2025 vs 27.6% in 2026) was the most common serotypes confirmed this month.
Uncommon Salmonella serotypes confirmed this month were S. Molade (4 human isolates since it was first confirmed in New Zealand in 2009) and S. Muenster (21 human isolates since it was first confirmed in New Zealand in 1994)
April
The number of isolates (n=96) confirmed this month showed an increase in comparison to the number of isolates confirmed in April 2025 (n=74). Salmonella Typhimurium ST19 (18.9% in April 2025 vs 28.1% in April 2025) was the most common type confirmed this month. Uncommon serotypes confirmed this month were Salmonella Birkenhead (44 human cases since it was first confirmed in New Zealand in 1989), Salmonella Muenster (22 human cases since it was first confirmed in New Zealand in 1994), and Salmonella Uganda (27 human cases since it was first confirmed in New Zealand in 1994).
May
The number of isolates (n=84) confirmed this month showed a decrease in comparison to the number of isolates confirmed in May 2025 (n=95). Salmonella Typhimurium ST19 (14.7% in May 2025 vs 20.2% in May 2026) was the most common type confirmed this month. Uncommon serotype confirmed this month was Salmonella Johannesburg (17 human cases since it was first confirmed in New Zealand in 1990), Salmonella Molade (5 human cases since it was first confirmed in New Zealand in 2009) and Salmonella Uganda (28 human cases since it was first confirmed in New Zealand in 1994).
June
The number of isolates (n=89) confirmed this month showed an increase in comparison to the number of isolates confirmed in June 2025 (n=54). Salmonella Paratyphi B var. Java ST43 and Typhimurium ST19 (3.7% and 7.4% in June 2025 vs 16.9% in June 2026) were the most common serotypes confirmed this month. Uncommon serotypes confirmed this month were Salmonella Apeyeme (9 human cases since it was first confirmed in New Zealand in 2011), Salmonella Itami (7 human cases since it was first confirmed in New Zealand in 2009), and Salmonella Molade (7 human cases since it was first confirmed in New Zealand in 2009).
July
The total number of isolates (n=68) confirmed this month showed a decrease in comparison to the number of isolates confirmed in July 2025 (n=93). Salmonella Typhimurium ST19 (14% in July 2025 vs. 17.6% in July 2026) was the most common serotype confirmed this month. Uncommon serotypes confirmed this month were Salmonella Apeyeme (10 human cases since it was first confirmed in New Zealand in 2011) and Salmonella Kisarawe (2 human cases since it was first confirmed in New Zealand in 2025).
August
The number of isolates (n=58) confirmed this month showed a decrease in comparison to the number of isolates confirmed in August 2025 (n=75). Salmonella Paratyphi B var. Java ST43 and Typhimurium ST19 (6.7% and 12% in August 2025 vs 19% in August 2026) were the most common strains confirmed this month. Uncommon serotypes confirmed this month were Salmonella Dublin (9 human cases since it was first confirmed in New Zealand in 1988) and Salmonella Meleagridis (7 human cases since it was first confirmed in New Zealand in 1988).