A recent outbreak highlights the fact that New Caledonia has one of the highest rates of leptospirosis in the Pacific region (see graph). In fact, in these islands, Leptospirosis is more common than Salmonellosis, Hepatitis A, Hepatitis B, Gonorrhea and Tuberculosis (see graph).

The following background information regarding Leptospirosis in New Caledonia is abstracted from GIDEON:

Leptospirosis is most common in west coast cattle-farming areas and rural Melanesian settings

• Disease rates are highest in the Bourail area.
• Disease rates peak during March to May.

Notes:

1. An average of 4 fatal cases are reported yearly.
2. 57 cases were diagnosed during 1983 to 1985.
3. 239 cases were reported during 2001 to 2005. The principal serogroups were Icterohaemorrhagiae (69%), Australis (8%), Pyrogenes (6%)

58% of cattle are seropositive.

The principal reservoirs in this country are rodents, pigs, horses and cattle.

The principal species are Leptospira serovars. Icterohaemorrhagiae, tarassovi, pyrogenes, canicola, australis and pomona.

• Serovar tarassovi accounts for 22% of cases, icterohaemorrhagiae 18% and pyrogenes 17%.

Notable outbreaks:
1989 – An outbreak (144 cases, 6 fatal) was reported, with 41% of the cases caused by serovar icterohaemorrhagiae.

Update: Also mentioned in ProMED

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