Prevalence of Dirofilaria immitis among shelter dogs in Tokyo, Japan, after a decade: comparison of 1999–2001 and 2009–2011

Open Access

Table 1.

Seroprevalence of Dirofilaria immitis infection in shelter dogs in April 1999 to March 2001 and April 2009 to March 2011 in Tokyo, Japan.

Dogs	Prevalence
	1999–2001	2009–2011
Research area
Urban areas	46.0% (23/50)^a	18.2% (10/55)^a
Suburban areas	46.0% (23/50)	28.9% (13/45)
Sex
Male	46.0% (23/50)^b	24.0% (12/50)^b
Female	46.0% (23/50)^c	22.0% (11/50)^c
Breed
Mixed breeds	58.5% (38/65)^d	50.0% (16/32)^e
Purebreds	22.9% (8/35)^d	10.3% (7/68)^e
Total	46.0% (46/100)^f	23.0% (23/100)^f

^a,d,e,f

The different letters indicate a significant difference among groups by chi-square test (P < 0.01).

^b,c

The different letters indicate a significant difference among groups by chi-square test (P < 0.05).

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