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Immune reactions to Wuchereria bancrofti infections in Tanzania. II. Characterization of the serum-mediated adherence reaction of leucocytes to microfilariae in vitro.

Investigations to characterize the in vitro reaction of serum-mediated leucocyte-adherence to microfilariae of Wuchereria bancrofti were carried out in Tanzania. The adherence reaction took place within one hour and at least two serum factors were involved: a heat-labile factor, present also in normal serum (probably complement), and a more heat-stable factor, present in positive serum only (probably an antibody). Neutrophils and eosinophils were involved in the reaction proportionately to Their numbers in the cell solutions used; the reaction killed significantly more microfilariae, than did adherence-negative tests. Microfilariae could be used for at least one week after their isolation from the donor, but a significant decrease in the percentage of reactive microfilariae occurred within 16 hours of isolation. A high degree of species specificity was observed when positive sera were tested against other nematodes. The involvement of complement and the speed with which the reaction took place is in contrast to the results of similar studies from India, and may indicate a difference in the parasite in the two continents.

Adolescent↗

Low dosage diethylcarbamazine administered by villagers for the control of timorian filariasis.

The results of mass treatment using low dosage diethylcarbamazine (DEC) in three small villages in West Flores, Indonesia, endemic for Brugia timori are described. DEC was distributed on a weekly basis by motivated persons in the community to nearly all villagers for 18 months. An educational programme was developed which focused on describing the relationship between microfilaraemia, vector and disease manifestations, the danger of repeated attacks of adenolymphangitis, and the efficiency of DEC in eliminating the parasites and attacks. During the consolidation phase motivated persons were assigned to treat promptly all cases with acute filariasis and to distribute DEC to all new residents. With this programme the microfilaria rates decreased to very low levels, even as detected by the use of membrane filtration techniques. The adenolymphangitis rates also decreased. An unexpected bonus was the cure of "elephantiasis" in many people. Mild side effects attributed to DEC were encountered only during the first few weeks of treatment.

Brugia↗

Specific diagnosis by CT and HRCT in six chronic lung diseases.

CT and high-resolution CT (HRCT) are both important modalities for imaging lung chronic disease, and certain features (distribution of disease in the axial plane, unilateral or bilateral disease, bronchovascular bundle thickening, septal thickening, central dot thickening, polygons, distortion of parenchyma, air-space disease, nodules) are well known to suggest specific diagnoses. In a series of 54 consecutive patients with six specific diseases (scleroderma or UIP, sarcoidosis, lymphangitic carcinomatosis, drug toxicity, lymphomas, eosinophilic granuloma), these diagnostic CT features were always present. In 50/54 cases, a histologic proof was obtained. In 36 patients with histologic confirmation of four different diseases and in six normal controls, we compared sensibility, specificity, and accuracy of chest radiography, chest CT, and HRCT and found the highest diagnostic accuracy by HRCT together with standard CT.

Adult↗

Squamous cell carcinoma of the cervix presenting as lymphangitic carcinomatosis: a case report and review of the literature.

BACKGROUND: Lymphangitic carcinomatosis (LC) secondary to carcinoma of the cervix is rare. The presenting symptoms are misleading and nonspecific, which often leads to delayed diagnosis. CASE: We present the case of a 24-year-old woman with dyspnea and lower back pain, who was found to have stage IIIb squamous cell carcinoma of the cervix complicated by pulmonary LC. CONCLUSIONS: Pulmonary LC is a rare but important manifestation of metastatic cervical cancer. Patients present with severe respiratory compromise, which mimics other, more common disease states. Diagnosis can be achieved by transbronchial biopsy. Optimal treatment of the patient with LC is not well defined, but a trial of chemotherapy and/or intravenous steroids may be warranted. Prognosis for this condition is poor.

Adult↗

Bacteriological studies of blood, tissue fluid, lymph and lymph nodes in patients with acute dermatolymphangioadenitis (DLA) in course of 'filarial' lymphedema.

Filarial lymphedema is complicated by frequent episodes of dermatolymphangioadenitis (DLA). Severe systemic symptoms during attacks of DLA resemble those of septicemia. The question we asked was whether bacterial isolates can be found in the peripheral blood of patients during the episodes of DLA. Out of 100 patients referred to us with 'filarial' lymphedema 14 displayed acute and five subacute symptoms of DLA. All were on admission blood microfilariae negative but had a positive test in the past. Blood bacterial isolates were found in nine cases, four acute (21%) and five subacute (26%). In 10 acute cases blood cultures were found negative. Six blood isolates belonged to Bacilli, four to Cocci and one was Sarcina. To identify the sites of origin of bacterial dissemination, swabs taken from the calf skin biopsy wounds and tissue fluid, lymph and lymph node specimens were cultured. Swabs from the calf skin biopsy wound contained isolates in nine (47%) cases. They were Bacilli in nine, Cocci in three, Acinetobacter and Erwinia in two cases. Tissue fluid was collected from 10 patients and contained Bacilli in four (40%) and Staphylococci in three (30%). Lymph was drained in four patients and contained isolates in all samples (100%). They were Staphylococcus epidermis, xylosus and aureus, Acinetobacter, Bacillus subtilis and Sarcina. Three lymph nodes were biopsied and contained Staphylococcus chromogenes, xylosus, Enterococcus and Bacillus cereus. In six cases the same phenotypically defined species of bacteria were found in blood and limb tissues or fluids. In the 'control' group of patients with lymphedema without acute or subacute changes all blood cultures were negative. Interestingly, swabs from biopsy wound of these patients contained isolates in 80%, tissue fluid in 68%, lymph in 70% and lymph nodes in 58% of cases. In healthy controls, tissue fluid did not contain bacteria, and lymph isolates were found only in 12% of cases. This study demonstrates that patients with acute episodes of DLA reveal bacteremia in a high percentage of cases. Diversity of blood and tissue bacterial isolates in these patients points to a breakdown of the skin immune barrier in lymphedema and subsequently indiscriminate bacterial colonization of deep tissues and spread to an blood circulation.

Adolescent↗

Acute adenolymphangitis due to bancroftian filariasis in Rufiji district, south east Tanzania.

A longitudinal prospective surveillance for acute adenolymphagitis (ADL) was carried out in three villages in Rufiji district. A sample population of 3000 individuals aged 10 years and above was monitored fortnightly for a period of 12 months. The annual incidence of ADL was found to be 33 per 1000 population and was significantly higher in males than females (52.7/1000 and 18.7/1000 respectively). ADL episodes were more frequent in the age group of 40 years and above. Individuals with chronic manifestations seemed to be more vulnerable to ADL attacks with 62.2% of the total episodes occurring in this group. Furthermore, individuals with lymphoedema experienced more frequent acute episodes compared to those with hydrocele and 'normal exposed'. ADL episodes ranged from one to five per annum and the majority of the affected (60.4%) experienced a single episode. The average duration of an ADL episode was 8.6 days and in 72.5% of the episodes the affected individuals were incapacitated and unable to do their normal activities for an average duration of 3.7 days. The physical incapacitation associated with ADL episodes emphasizes the significance of lymphatic filariasis as a major public health problem of substantial socio-economic consequences.

Adolescent↗

Descriptive epidemiology of lymphatic filariasis in Ghana.

A national filariasis survey was conducted to determine the prevalence and distribution of Wuchereria bancrofti microfilaraemia and clinical disease associated with lymphatic filariasis in Ghana. Multi-stage systematic sampling was used to select households to be examined in all 10 administrative regions of the country. The results showed a high prevalence of microfilaraemia and disease with considerable regional variation in all the quantities investigated. In general, the disease was more prevalent in the northern guinea savannah and the southern coastal savannah, while the middle forest belt was relatively free. Even within the regions, there was considerable variation in the distribution of the disease. The disease is of potentially major public health significance, particularly in the northern and coastal savannahs, and requires the design and implementation of a control programme.

Adolescent↗

The relationship between infection and disease in Wuchereria bancrofti infection in Ghana.

The relationship between infection and clinical disease in Wuchereria bancrofti infection was investigated in a community-based study in different endemic areas in Ghana. At the individual level, there was no association between acute adenolymphangitis and infection (microfilaraemia) status. There was a negative association between infection status and lymphoedema/elephantiasis, but a positive association with hydrocele; however, the intensity of infection was negatively associated with both elephantiasis and hydrocele. The community prevalence of infection was strongly associated with the prevalence of clinical filariasis (especially hydrocele). There was a strong positive association between the prevalence of infection in males and the odds of a case of hydrocele being microfilaraemic, suggesting that there is no acquired immunity to reinfection in cases of hydrocele. The pathophysiologies of elephantiasis and hydrocele may therefore differ from one another, and require further investigation.

Age Distribution↗