Assessing the Effect of Neglected Tropical Diseases on Plasmodium Falciparum Transmission in an Area of Co-endemicity (TRANSMAL)

University Hospital Tuebingen

Status: Completed

Conditions: Malaria Transmission

Treatments: Other: Post treatment follow up; Other: Pre-treatment follow up; Other: Olfactometer experiment; Other: S. haematobium treatment

Study type: Observational

Funder types: Other

Identifiers

NCT02769013

Transmal study version 2.0

Details and patient eligibility

About

Assessing the effect of neglected tropical diseases on Plasmodium falciparum transmission in an area of co endemicity.

Full description

The project is divided in three different work packages that cover the life cycle of P. falciparum :

In Work Package 1 (WP1) the investigators will assess whether S. haematobium infection increases the human reservoir of P. falciparum by increasing the carriage rate and incidence of P. falciparum gametocytaemia as well as by increasing the proportion and incidence of subject with sub-microscopic P. falciparum infection. The investigators will also determine whether this increase in gametocyte carriage is a consequence of an impairment of the immune response of helminth infected subjects to P. falciparum. In Work Package 2 (WP2) the investigators will determine whether the transmission of the sexual forms of P. falciparum from the human host to mosquito is increased in S. haematobium infected subjects compared to uninfected controls. Moreover the investigators will study whether the immunological changes induced in S. haematobium infected subjects lead to a decrease of the transmission reducing activity of IgG specific to Pfs48/45 and Pfs230 (both capable of blocking/impairing further development of P. falciparum in the mosquito gut). Finally in Work Package 3 (WP3) the investigators will assess whether S. haematobium infection affects the transmission of P. falciparum from the mosquito to the human host. This effect will be determined indirectly by assessing whether S. haematobium infected subjects are more attractive to mosquitoes.

Enrollment: 380 patients

Sex: All

Ages: 6 to 30 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Subjects aged from 6 to 30 years
• Without severe or moderate disease
• Agreement to be enrolled in the study (written informed consent or consent by the legal representative and assent)
• Living in the study area for at least 1 year

Exclusion criteria

• Anaemia with haemoglobin less than 8g/dl
• Know sickle cell disease
• Macroscopic haematuria
• Any other know severe disease

Trial design

380 participants in 4 patient groups

S. haematobium positives in Gabon

Description:

Asymptomatic volunteers infected with S. haematobium and living in Gabon

Treatment:

Other: S. haematobium treatment

Other: Olfactometer experiment

Other: Post treatment follow up

Other: Pre-treatment follow up

S. haematobium negatives in Gabon

Description:

Volunteers not infected with S. haematobium and living in Gabon

Treatment:

Other: Olfactometer experiment

Other: Post treatment follow up

Other: Pre-treatment follow up

S. haematobium positives in Ghana

Description:

Asymptomatic volunteers infected with S. haematobium and living in Ghana

Treatment:

Other: S. haematobium treatment

Other: Olfactometer experiment

Other: Post treatment follow up

Other: Pre-treatment follow up

S. haematobium negatives in Ghana

Description:

Volunteers not infected with S. haematobium and living in Ghana

Treatment:

Other: Olfactometer experiment

Other: Post treatment follow up

Other: Pre-treatment follow up