[Housedust mites in Punta Arenas city, Chile].

In medicine, the importance of mites in house dust gains importance from day to day. The close relation between these arthropods and man is the cause of a series of health problems such as allergic asthma, rhinitis and/or dermatitis. House dust samples were collected between January and December 1991 in Punta Arenas, city, Chile.

Diplostomatid metacercariae in the brain of silversides from Lake Riñihue, Chile.

The tissue locations and effects produced by metacercariae of Diplostomum (Austrodiplostomum) mordax and Tylodelphys destructor in the brain of 30 silversides (Basilichthys australis) from Lake Riñihue in Chile, were evaluated. Metacercariae were mainly observed in the interlobular infoldings, meninges and ventricles of the brain. The prevalence was 18 (60%) and the intensities were usually low (1 to 9 metacercariae), with no inflammation or invasion of the parenchyma, except for one fish which had 130 parasites associated with a moderate inflammatory reaction.

[Seasonal infection by metacercaria of Diplostomum (Austrodiplostomum) mordax (Szidat and Nani, 1951) and Tylodelphys destructor Szidat and Nani, 1951 in the Chilean Silverside, Basilichthys australis Eigenmann, 1927 (Pisces:Atherinidae) in Lake Riñihue].

Between 1993 and 1994, 129 specimens of Basilichthys australis from Lake Riñihue (39 degrees 50 minutes S; 72 degrees 20 minutes W) in the south of Chile were examined, in order to determine the prevalence and mean intensity of infections by Diplostomum mordax and Tylodelphys destructor metacercariae in the brain of fishes. Prevalence and mean intensity of D. mordax and mean intensity of T.

[Prevalence of protozoa infections in synanthropic rodents in Valdivia City, Chile].

In order to determine the prevalence of infection by blood and intestinal protozoa in 57 synanthropic rodents from Valdivia city, a study was carried out in the period march-september 1986. The group of rodents studied was constituted by 31 Mus musculus, 19 Rattus rattus and 7 Oryzomys longicaudattus, being 42 males and 15 females. Diagnostic forms of protozoa were found in 70.

[Intestinal geohelminthosis in man and domestic animals in the riverside sections of the Valdivia River Basin, Chile].

In March-October 1987 were analyzed 1295 coprological specimens in a sample of the human population who lives in riverside localities in the Valdivia River Basin, Chile. A 23.6% of examined persons presented infection by one or more helminth species.