02-07-1977 Planning Packet - Laserfiche WebLink

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’ V* appropriate host and ncrging from a snail, iman host, penetrate nown as snimmers* gain death, however. ! it is a chancy bust- ome individuals will increased statistically iced in a season by and the fact that i in penetrating an tential of producing I reproduction. This parasitic species is imium on reproduc* al, behavioral, and thance the chances irious events in the with appropriate Mil and the verte- 5’ itch w'as first dis> rt, a noted parasit* ol of Hygiene and liversity. Dr. Cort’s tiring the 1920s at logical Sution at near the northern *eninsuia in close where swimmers* over the years, ng at a small pond 1$ the Sedge Pool, rash which came ►ol Itch.*’ Dr. Colt tch” was caused of certain schis- rasitize birds and reports of schis- nantes, began to 'Id. All that have arious species of itermediate hosts, i- M uch has been istories of several le species, about ermediate hosts, > and mammals experimentally VA H* ilj i i . i . I ■■iHn * « %• infected with the worms. ^ names of some of >he more common parasites •nails, and vertebrate hosts known or belieted to S unpliated with the disease in the Great Lakes reeion wain the common jenus TrichobilharzUi. tend to be »«'" i" appearance, both « M !, i "•* ‘ercariae shoiv rec- «^.»ble d,(Terences in behavior, and the ej of “e dtilts are in some instances strikingly dilTcrcnt The »«l .ntermediate hosts (Fig. 2) are members of [wo hreML L?”' freshwater pulmonate (air- •''‘•"•’“'ad in North Amewa, although some of the species have only III geographic distribution. Some of the snaiU «e common near sandy beach areas while others are characteristic of weedy, mud-bottomed areas in lakes orjonds. ___ __________ “ineTa^est gaps in our^ioinedgeorihnifccy^ these parasites pertain to the vertebrate dei.nitive hos s. As indicated in Table I, various species of ducks, passerine birds, and mammals have been iT 'r or «n be eaperimen- y infected with the parasites. Recent unpublished data suggest that most birds that come in contact ■ ' ^rnsKcs wiill act as natural hosts. What si^ics of birds are involved, where they pick up the infections, how serious the elfects are on the health of the birds, and w-hether the infections are parsed IZc L'lt' '*'* fr"- orspring all remain very incompletely known. It docs Mem, however, that ducks and other migratory water- fowl which are infected often pass thes: infetions- ft CnCMIA ffNtnATCS SKIN OF IWD C«CA«U FiNCniATCS SKIN OF MTHO •N WASM IKO, CFPCAdlAt MATUItt INTO AOOIT IIOOO FLUFFS DAUCHTTP SFOFOCVSTS P«C0UCf IHOUSANOS OF CfRCAIIIA LAFVAt CKCARIAC RfllASIO INTO AA»f»^^ SWIM AWAY IOCS OF FfMAir IIOOO FlUKR \ IfACH WATfl VIA FtCIS CF IMO too MATCHIS INTO MWAOOIU m' (CltlATfO LAPVA) WHICH FtNCTPATfS ipjAn I.,’™ iii-r*'”*'” '~'o "0'“» srcocvil.WHICH FFODUCIS NoMtkOuS OAoCHTtl SFCMtOCYi P5 Life cycle of typical ••swimmers itch parasite. 19 *! i ;.7 . t B • . ; i ■. V-? •-.'fe ..,v J, 8ii snail spec mediate hosts i (tch" in the Gri b. Physs gyrifu »t9gn*tis; e. Lyi ginst*. Table I. Paras dermatitiS’prodi region. * Phrasiie TriehoMharsia eeelhia Trkhobitharzia stagHico/ae Triehobilharzia physellae Cigantobilharzia hmoHensU Sekislosomatiiirn douthitti •After Cort 0950 unpublished info via eggs and these birds' fal With the wid and the migra definitive hosts mers* itch to ne C. Wall, in his the swimmers* evidence that i ward in that sta •he years 1939- problems to th mission; only o half of the Low periods betweer to 44 lakes repoi 14 were located