Plagiorchis muris: recovery, growth and development in albino rats

1998 ◽  
Vol 72 (3) ◽  
pp. 251-256 ◽  
Author(s):  
S.J. Hong ◽  
J.H. Ahn ◽  
H.C. Woo
Keyword(s):  
Small Intestine ◽  
Post Infection ◽  
Recovery Rate ◽  
Growth And Development ◽  
Egg Production ◽  
Albino Rats

AbstractMetacercariae of Plagiorchis muris, obtained from naturally infected dragonflies, Sympetrum eroticum, successfully established in 4-week-old albino rats up to 14 days post-infection (p.i.) but by day 28 p.i. the recovery rate had significantly decreased. The genital primordia in excysted metacercariae were differentiated into those of metraterm, Mehlis' gland, ovary and cirrus pouch, with the primordial testes appearing on day 1 p.i. The vitellaria and eggs in the uterus were present in flukes on days 2 and 4 p.i., respectively. Mature flukes were established in the lower part of the small intestine on day 5 p.i., with the peak of egg production occurring on day 14 p.i. Growth of the flukes continued up to day 28 p.i.

Study on Centrocestus armatus in Korea. II. Recovery rate, growth and development of worms in albino rats

1989 ◽  
Vol 27 (1) ◽  
pp. 47 ◽  
Author(s):  
S J Hong ◽  
H C Woo ◽  
J Y Chai ◽  
S W Chung ◽  
S H Lee ◽  
...  
Keyword(s):  
Recovery Rate ◽  
Growth And Development ◽  
Albino Rats

A second peak of egg excretion in Strongyloides ratti-infected rats: its origin and biological meaning

Parasitology ◽  
1999 ◽  
Vol 119 (2) ◽  
pp. 221-226 ◽  
Author(s):  
E. KIMURA ◽  
Y. SHINTOKU ◽  
T. KADOSAKA ◽  
M. FUJIWARA ◽  
S. KONDO ◽  
...  
Keyword(s):  
Small Intestine ◽  
Large Intestine ◽  
Filter Paper ◽  
Post Infection ◽  
Egg Production ◽  
Infective Larvae ◽  
Faecal Culture ◽  
Biological Meaning ◽  
Second Peak

In Strongyloides ratti-infected rats, 2 peaks of egg excretion were observed; a large one with maximum egg production on days 7–8 of infection and a small more inconspicuous one around day 25. The second peak, which had been ignored in most studies, was produced by adults in the caecum and the colon. The adults were larger in length and had more embryonated eggs in the uterus compared with adults in the small intestine at day 25 post-infection. It is suggested that parasitic adults once expelled from the small intestine resettle and recover in the large intestine. Filter paper faecal culture carried out for 9 days at different days post-infection revealed that the total number of infective larvae that developed during the second peak was twice the number that developed during the first peak, despite the fact that total egg output during the second peak was less than one twentieth of the first peak. The results suggest that the small second peak was as important as the first one in the transmission of S. ratti.

scholarly journals DATA ON THE DEVELOPMENT OF HETERAKIS PAPILLOSA IN THE FOWL

1921 ◽  
Vol 34 (3) ◽  
pp. 259-270 ◽  
Author(s):  
H. W. Graybill
Keyword(s):  
Small Intestine ◽  
Salt Solution ◽  
Final Stage ◽  
Minimum Temperature ◽  
Growth And Development ◽  
Room Temperature ◽  
Freezing Temperature ◽  
Physiological Salt Solution ◽  
Natural Conditions ◽  
Short Intervals

In observations on the development of the ova of Heterakis papillosa in cultures, it was found that they failed to develop at a temperature ranging from 2.5–8°C., but developed slowly at a temperature of 11.5–13.5°C. The minimum temperature for development seems to lie between 8° and 11.5–13.5°C. At temperatures ranging in various cultures from 18–29°C. ova developed to their final stage in 7 to 12 days. Undeveloped ova subjected to a freezing temperature for a period of 4 days were viable at the end of that time. Fully developed ones remained alive when exposed out of doors for a period of 7 days at a temperature ranging from 5–62°F. Undeveloped ova survived desiccation at room temperature for a period of 16 days, but not for 41 days. Fully developed eggs were alive after desiccation for 18 days, but not after 49 days. In another instance they were no longer viable after 10 days. Embryos within ova kept in physiological salt solution at room temperature survived during a period of a little over 12 months. Fully developed ova kept in soil outdoors under circumstances approaching natural conditions contained living embryos after a period of 8 months. From a study of a series of artificially infested chickens killed at short intervals it appears that the ova of Heterakis hatch in the small intestine and the larvæ pass by way of the small and large intestines to the ceca where they undergo development to maturity. Larvæ found in the mucosa of the ceca were not in an encysted condition. Feeding of numerous artificially incubated ova may lead to a light infestation, the cause of which has not been definitely determined. A period of 57 days was required for larvæ to reach maturity in a host. The entire cycle from egg to adult requires a minimum time of about 64 days. A brief study of the growth and development of larvæ within the host has been made. No evidence was found of a migration through the tissues. A few penetrate into the mucosa of the ceca.

Effect of flubendazole on the number of first-stage larvae of Angiostrongylus cantonensis released in the faeces of treated rats

1990 ◽  
Vol 64 (2) ◽  
pp. 87-95 ◽  
Author(s):  
Jun Maki ◽  
Toshio Yanagisawa
Keyword(s):  
Microscopic Examination ◽  
Post Infection ◽  
Egg Production ◽  
Angiostrongylus Cantonensis ◽  
Control Groups ◽  
Faecal Examination ◽  
Third Stage

ABSTRACTThe effect of flubendazole orally administered at 10 mg/kg/day for 5 consecutive days (the 11th, 20th or 40th post-infection) on the number of first-stage larvae (L1) of Angiostrongylus cantonensis released in the faeces of rats each infected with 40 third-stage larvae was determined. Faecal examination for 5 months, the period from medication to dissection of rats, showed that L1 release ceased in all the rats of medicated groups by about 1 week after the termination of dosing and resumed 1–2 months later in 86% of the rats which were dissected at the end of experiments with the recovery of adult worms of both sexes. Throughout the period of 5 months, about 2–4×104 L1/gram of fresh faeces was recorded in non-medicated control groups. There was a 38–79% reduction in adult worms at the dissection. Microscopic examination of the uteri of the remaining adult worms and lung tissues of rats confirmed no normal egg production in the adult worms from rats of medicated groups, except the rats with the resumption of faecal L1 release.

Observations on the establishment, growth, and development of Hymenolepis hopkinsi Schiller, 1951 (Cestoda) in the mallard

1975 ◽  
Vol 53 (12) ◽  
pp. 1892-1897
Author(s):  
J. Daniel McLaughlin
Keyword(s):  
Intermediate Host ◽  
Post Infection ◽  
Growth And Development ◽  
Hyalella Azteca ◽  
Constant Size ◽  
The Mean

Most young H. hopkinsi become established in the caeca of 3-week-old mallards 6 h after ingestion. Migration of H. hopkinsi into the caeca is completed within 36 h after infection. Worms increased in size rapidly between 6 h post infection and 7 days post infection, when the worms became gravid. The worms maintained a relatively constant size from day 7 until the termination of the experiment (day 19). Proglottid production begins 12–24 h after infection and the number increases rapidly until day 7. The mean number of proglottids per worm remained relatively constant until the termination of the experiment. Egg packets of H. hopkinsi are passed periodically in the caecal evacuations beginning 7 days after infection. These are infective immediately to the intermediate host Hyalella azteca.

scholarly journals Observations on the feeding behaviour of parasitic third-stage hookworm larvae

Parasitology ◽  
1993 ◽  
Vol 106 (2) ◽  
pp. 163-169 ◽  
Author(s):  
J. M. Hawdon ◽  
S. W. Volk ◽  
R. Rose ◽  
D. I. Pritchard ◽  
J. M. Behnke ◽  
...  
Keyword(s):  
Small Intestine ◽  
Post Infection ◽  
Feeding Behaviour ◽  
The Other ◽  
Ancylostoma Caninum ◽  
Necator Americanus ◽  
Other Hand ◽  
Third Stage ◽  
Small Intestines

SUMMARYThe feeding behaviour of parasitic 3rd-stage larvae (L3) of the hookworms Ancylostoma caninum, A. ceylanicum and Necator americanus was examined. Less than 11% of A. caninum L3 recovered from the small intestines of dogs infected orally were feeding at 4–48 h post-infection (p.i.). and none of the A. ceylanicum L3 recovered from the intestines of orally infected hamsters had resumed feeding. All L4 of both species recovered at 36 and 48 h p.i. had resumed feeding. On the other hand, approximately 16% of the A. ceylanicum L3 recovered from the skin of percutaneously infected hamsters at 18 h were feeding, and the percentage feeding increased to nearly 58% at 44 h p.i. Necator americanus L3 recovered from the skin of percutaneously infected neonatal hamsters resumed feeding at 6–12 h p.i. and reached 90–94% by 18 h. Feeding began to decline at 66 h, and reached 29% at 120 h p.i. This decrease was associated with the migration of larvae from the skin to the lungs. By 192 h p.i. over 95% of the larvae had reached the small intestine, and all had moulted to the L4. The results indicate that parasitic L3 resume feeding in the skin during percutaneous infections, and suggest that feeding by hookworm L3 correlates with the resumption of development.

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