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. 2013 Jun 26;2(6):e40. doi: 10.1038/emi.2013.40

Table 1. Antibodies to A(H1N1)pdm09 in seals and sea lions in California, USA, 2009–2012.

  % HI positive  
  Northern elephant seals Harbor seals3 California sea lions4 Range HI titers
20091 5 (2/37) 8 (3/40) 0 (0/80) <10 to 160
20101 30 (11/37) 2 (1/50) 7 (4/55) <10 to 640
20111 48 (29/60) 0 (0/50) 6 (3/48) <10 to 640
2012        
Adult females2 54 (19/35) - - <10 to 160
Pups 1st sample2 63 (22/35) - - <10 to 320
Pups 2nd sample2 75 (15/20) - - <10 to 320

Sera tested by HI at dilutions of 1/10, 1/20, 1/40, 1/80, 1/160, 1/320, 1/640. Titers ≥40 were considered positive.

1

Free-ranging and stranded adults and juveniles in northern and southern California.

2

Free-ranging adults and pups at the Southern California Channel Islands.

3

Seropositive harbor seals were stranded weaned pups from northern and central California with HI titers of 40 to 160.

4

Seropositive California sea lions were stranded and free-ranging subadults and adults from northern and southern California with HI titers of 40 to 80.