human envenomation by an aglyphous colubrid snake, liophis miliaris

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Cuad. herpero L. 14 (2 ): 15 3-1 54. 200 1 (2000)
HUMAN ENVENOMATION BY AN AGLYPHOUS COLUBRID SNAKE,
LIOPHIS MILIARIS (LINNAEUS, 1758)
M ARÍA CRI STI NA DOS S ANTOS- COSTA
&
MARCOS D r-B ER NA RDO
Loborotóri" de Herpetolog io. i\l uséu de Ci~ncio s e T ec nolog ia. POllt ifícia Univers idade Cat ól ica do Río Grande do S u!. Av. Ipíranga. 668 1.
CEP 906 19-900 . Pono Alegre. Río Gra nde do Su!' Brazí!. E-maí l: [email protected] / madibe @pucrs.br
In Braz il. so me snake s of the fa mily Colubri dae. usuall y regarded as not venomous, are
respo nsable by serious and even so fatal acci dent s. Some op ist hoglyphous snakes th at occur in so uth ern Brazil. as Philodrm s olfersii
(Li c ht enstei n. 1823) . Bo iru na lI1 acula ra
(Boulenge r. 1896). Phalorris lell1nisca rllslri/ineaTus Boul enger. 1889 and Thal17n odynastes
srrigaTlIs (GÜn ther. 1858) deserve greatest attenti on because they have already caused human envenomation as reported by many authors
(Hoge. 1952 ; Lema. 1978a; Salomao & Di-Bernardo. 1995; Santo s-Cos ta et al .. in press) .
There is at leasl one record of a fatal aceident
ca used by Ph ilodrms olfersii (Salomao & DiBe rn ardo . 1995 ) and many or her records of
se ri ous acci dent s. with th e patie nts showin g
edema. pain and enlarged ax illary lymp h nodes
(Nickerson & Henderson. 1976; Sil va & Buononato. 1984: Dav id & Ineich. 1999). Phalotris le/11niscatlls Iri/in eallls. a fo ssoria l snake,
dese rves attention by the gravi ty 01' its envenomali on. which may causes hemorrhagic maniI'estati ons. local pain, pares thesia and acute renal fai lu re (Lem a, 1978b).
Accidents by aglyphous snakes are liule repon ed. Some spec ies may cause hi gh-gravi ty
envenomations. li ke Rhabdophis rigrinus (Boie,
1826). Thi s snake has very tox ic venom that
ac ts directl y on prothrombin time, provoking
hemorrh ag ic manifestatio ns and blood coag ulat ion disorders. In Japan some deadl y cases
we re registered (Mitt lema n & Goris, 1976;
Ogawa & Saw ai, 1986; David & Ineich, J 999).
Seib ( 1980) suffered an acc ident by Uroth eca
elap oides (Cope. 1860) and presented intense
local pain fo ll owed by ecchimos is and inflammation of the axi ll ary Iym ph nodes. He was
sucéessfull y treated wit h anti-Crotalus serum.
At 20h 40min of November 4 th , 1996, in the
Mun ici pali ty of Capin zal, State of Santa Catarina, Brazil, the junior author (33 years old, 1.76
m hi gh, 71 kg weight) was bitten in the fifth
fin ger of the right hand while capturing aj uveni le Liophis miliaris (Linnaeus, 1758) (27 ,45g;
472 ,0 mm total length ; housed in Mu seu de
Ciencias e Tecnologia da PUCRS under number MCP 7763). While biting, the snake ehewed
se veral ti mes, re leas in g after few seco nd s.
Subsequentl y there was intense local bleed ing
and, three min utes later, edema, first on finger
and progress ively expandi ng to the enti re hand
and wri st, wi th intense itching, local pain and
paresthesia, the latter on the right side of the
hand. Thi s proeess continued fo r 40 minu tes ,
evolvin g to the cure without treatment.
The paresthes ia and edema reported in thi s
case are probably consequences of the proteoIytic properties of the sali va. Experiments testing extracts of oral glands of the aglyphous
SibJ l1 om orphus n euwiedi (Iherin g, 1910)
showed proteolytic acti vity on casein ; thj s same
ex tract, inocul ated in rats and slugs, occasioned change of behaviour and paralysis (Laporta-Ferreira & Salomao , 199 1).
The intense local bleeding here reported was
also accounted, regarding accidents by Rhab dop his tig rinus tigrinus (Sakai et al. , 1990).
Although the patients menti oned in that report
suffe red serio us blood coagulation di sorders,
thi s fact was not observed in the present case.
Little is known on the cherrucal nature of the
Notas & Novedades zoogeográ fi cas
sa li va 0 1' ag lyphou s snakes . and w hat lO do in
lhe prese nee of aee ide nts with sig ns 01' e nveno mali o n. We propose a re valu ati o n 01' the eonce pl s re laled to e nven o mati o ns ca used by
sna kes gene rieally called ' not ve no mo us', and
inlc nd to ale rt profess io nals 01' the hea lth area
abo ul lhe necess ily o f atte ndin g carefull y accide nl S invo lving these anim als.
A CK.!'10WLEDGM ENTS
W e a re g rate ful lo Marci o B o rges Martin s,
Ro na ldo Fe rn andes and P atri c k David ro r sugge sli o ns and correclion s o n the dra rl manu sc ri pt. Th e co ntract eS labli s hed be twee n lh e
Mu scu de Ci e nci as e Tecnol og ia da PUCRS and
E LETROS U L prov id ed lh e o ppo rtunity for
condu c tin g lhe fi e ld slud y o n w hi e h lhi s re po rt
was based.
CITED LITERATURE
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_ _ o 1978b. Re lato de um envene name nlo po r
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