Folia Parasitologica, vol. 31 (1984), issue 2

Experimental concomitant toxoplasma and malaria infection in rats.

M A Rifaat, S A Salem, M E Azab, I A el-Razik, E H Safer, S R Beshir, S F el-Shennawy

Folia Parasitologica 31[2] 97 (1984)

The effect of concomitant toxoplasma and malaria infection on the reticuloendothelial system was investigated in rats. This was evaluated by the level of plasmodial parasitaemia; humoral antibody response; effect on splenic weight; histopathological changes in thymus and spleen; histopathological and histochemical changes in liver. The parasitaemia appeared after 2 days in single malaria and concomitant infections. The peak was reached after 6 days with single and precedent malaria, and after 10 days with precedent toxoplasma. The clearance of parasitaemia was delayed to 30 days with concomitant infections instead of 14 days with single malaria. Higher...

Redescription of Neocamallanus singhi (Nematoda: Camallanidae) with a note on related species.

N C De, G Majumdar

Folia Parasitologica 31[2] 105-111 (1984)

The present paper deals with the redescription of the nematode Neocamallanus singhi Ali, 1957 based on specimens collected from the fish, Channa striata from Burdwan, West Bengal, India. Comparative study of this species with other related forms described from freshwater fishes of India and Pakistan indicates that Neocamallanus bengalensis Soota et Chaturvedi, 1971 and N. ophicephali Rehana et Bilquees, 1972 are synonyms of N. singhi.

SOME OBSERVATIONS ON THE EGG STRING OF A NEMATOMORPH WORM, PARAGORDIUS SP

F H WHITTAKER, R L BARKER

Folia Parasitologica 31[2] 111-112 (1984)

Notes on the development of metacercaria and adult of Echinostoma porteri Fashuyi (Echinostomatidae).

S A Fashuyi

Folia Parasitologica 31[2] 113-119 (1984)

The metacercaria of E. porteri was found to retain its viability for a longer time in Bulinus (Physopsis) globosus (Morelet) than in Bulinus (Bulinus) forskalii (Ehrenberg) and Lymnaea natalensis (Krauss) which is the natural host for other larval stages. It becomes infective to definitive hosts about 6 h after commencement of encystment and loses its viability after 14 days in the snail host. Development of adult takes place experimentally in chicks, pigeons and rats, but hosts show age resistance to infection. Growth of adult worm is most rapid between 4th and 6th day and declines after the 17th day. Proportionate increase in body length is higher...

Effect of some abiotic factors on the survival of dicrocoelium dendriticum eggs in laboratory conditions.

J M Alunda, F A Rojo-Vázquez

Folia Parasitologica 31[2] 121-126 (1984)

In the present work the results obtained from the study of the effect of temperature, RH, UV radiation and day-night thermal variations, in controlled laboratory conditions, on the survival of D. dendriticum eggs in sheep faeces are described. Mortality was seen to be maximum with a RH of 75-80% and temperatures higher than 18 degrees C. The results are compared with those obtained in natural conditions. It is suggested that the final cause of the mortality of the eggs both in laboratory and natural conditions could be the action of some microorganisms.

Hydatigera taeniaeformis (Batsch, 1786) as the cause of mass deaths of muskrats.

L Dvoráková, J Prokopic

Folia Parasitologica 31[2] 127-131 (1984)

ULTRASTRUCTURE OF THE METACERCARIA AND SPOROCYST SAC OF LEUCOCHLORIDIUM-PERTURBATUM POJMANSKA, 1969

Z ZDARSKA, T N SOBOLEVA

Folia Parasitologica 31[2] 133 (1984)

Sense organs of the nematodes Trichinella pseudospiralis Garkavi, 1972 and T. nativa Britov et Boev, 1972.

D Hulínská, B Shaikenov

Folia Parasitologica 31[2] 141 (1984)

The structure and distribution of the sense organs of the head and the tail of two day-old Trichinella species (females) have been determined by transmission (TEM) and scanning (SEM) electron microscopy. In both species occur 16 cephalic sense organs, which contain three modified dendritic processes, in addition to the amphids. The nerve cell bodies are situated in the area above the nerve ring. The amphid contains ten dendritic processes. The sense organs open to the external environment by pores through the cuticle. Above the bulbous tip, the dendritic processes are surrounded by hypodermal cells. They enter posteriorly the pseudocoelom and join...

NEW SPECIES OF GYRODACTYLUS (MONOGENEA) FROM SCHIZOPYGOPSIS-STOLICZKAI STEINDACHNER

R ERGENS, M ASHUROVA

Folia Parasitologica 31[2] 146 (1984)

Morphological and histochemical studies on the ovarian development and oogenesis in Paramphistomum cervi (Digenea: Paramphistomatidae).

B C Gupta, V R Parshad, S S Guraya

Folia Parasitologica 31[2] 147 (1984)

The ovary in 4-week-old worms contains undifferentiated germ cells. The oogonial differentiation, together with the appearance of some PAS-positive material in the ooplasm occurs in the ovary of 8-week-old worms. The ovary of 16-week-old worms contains only oogonia and oocytes and no germ cells. In adult worms, the oocytes reach the pachytene stage and further development is arrested at this stage. Nucleolar fragmentation and subsequent transport of nuclei to the ooplasm have been observed. The ooplasm contains nutritive material rich in proteins, carbohydrates and lipids. Its amount varies with different stages of oogenesis. The localization of various...

Comparison of counterimmunoelectrophoresis with indirect haemagglutination test in the detection of antibodies in rabbits experimentally infected with various species of ascarids.

S Lukes, J Prokopic

Folia Parasitologica 31[2] 157-162 (1984)

Counterimmunoelectrophoresis (CIEP) and indirect haemagglutination (IHA) were used for the detection of antibodies in 437 sera of rabbits experimentally infected with Ascaris suum, Toxocara canis and Toxascaris leonina. CIEP showed 44.0-52.3% positivity in A. suum, 25.5% in T. canis and 19.7-29.2% in T. leonina infection, whereas the positivity detected by IHA was 59.8-90.2% in A. suum, 44.8% in T. canis and 59.6% in T. leonina infection. A comparison of the two tests reveals that CIEP is a suitable, rapid and simple method for orientation examinations in ascarid infections.

Mosquito studies on the Isla de la Juventud, Cuba, at the beginning of rain period.

J Ryba, O Fuentes, V Danielová, A Fernández

Folia Parasitologica 31[2] 163-167 (1984)

A total of 8418 mosquitoes belonging to 16 species were collected in 11 localities of the Isla de la Juventud. The most abundant species was Aedes taeniorhynchus (92% of specimens collected). The species Wyeomyia vanduzeei and Mansonia nigricans were encountered on the island for the first time.

Susceptibility to DDT and some other insecticides of head lice (Pediculus capitis De Geer) in Czechoslovakia.

V Rupes, J Ledvinka, J Chmela, J Pinterová

Folia Parasitologica 31[2] 169-175 (1984)

For testing the susceptibility of the head louse to insecticides impregnated bunches of polyamide fibres, whose diameter resembled that of human hair (0.1 mm) were used. In this manner a low mortality of control lice collected from infected persons was obtained (2.9% after 16 hours of exposure). Even after 25 years of DDT use no apparent resistance could be demonstrated in 25 tested louse populations and cross resistance to permethrin in 7 tested populations. The diagnostic concentration for resistance to pp'-DDT was established at 1%. Of the tested insecticides the highest toxicity was shown by malathion (LC50 = 0.000 018%), pirimiphos-methyl had...

The role of the house fly (Musca domestica L.) in the transmission of Coxiella burnetii.

M Hucko

Folia Parasitologica 31[2] 177-181 (1984)

The flies which are fed a single rickettsia suspension keep their infectivity throughout their life and can contaminate environment as long as that. Under conditions of experiment their life span is 32 days. Coxiella burnetii survives in the faeces of flies as long as 80 days, in the dead flies as long as 90 days.

Isolation and properties of alpha-amylase from perienteric fluid of Ascaris suum.

J Zenka, J Prokopic

Folia Parasitologica 31[2] 183-186 (1984)

The properties of alpha-amylase from perienteric fluid of Ascaris suum were studied. The enzyme is strongly activated by chlorides at a simultaneous shift of pH optimum. It is fully activated already at 10(-3) M concentration of chlorides. A method of alpha-amylase isolation was modified with respect to these properties to give the purification degree 278 and yield of 11%.

The replication and eclipse-phase of the tick-borne encephalitis virus in Dermacentor reticulatus.

J Nosek, M B Korolev, S P Chunikhin, O Kozuch, F Ciampor

Folia Parasitologica 31[2] 187 (1984)

Particles of tick-borne encephalitis virus measuring 42-50 nm were found in in D. reticulatus nymphs after eclipse-phase lasting 10 days and were localized in epidermal and salivary gland cells.

Experimental infection of hedgehog (Erinaceus europaeus) with Bhanja virus.

Z Hubálek, P Rödl, Z Juricová

Folia Parasitologica 31[2] 189-190 (1984)

First record of developmental stages of Cryptosporidium sp. in various organs of experimentally infected mice and spontaneously infected calves.

I Pavlásek

Folia Parasitologica 31[2] 191-192 (1984)