The research was presented at the American Society of Tropical Medicine and Hygiene in Atlanta.
Ms Johnston, 28, is a graduate of the London School of Hygiene and Tropical Medicine.
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The study has been published this week in the American Journal of Tropical Medicine and Hygiene.
I'm going to do a master's program in London for a year in tropical medicine and international health.
Dr Madeleine Thomson, a consultant and lecturer in tropical medicine, was part of the team which analysed the satellite data.
Prof Brendan Wren, from the London School of Hygiene and Tropical Medicine, has been studying C. difficile for 25 years.
Professor Paul Fine, from the London School of Hygiene and Tropical Medicine said the BCG story was a very complicated one.
He was a lecturer at the Liverpool School of Tropical Medicine when he became the first Briton to win a Nobel Prize.
Those figures are based on an unpublished study from the Health Protection Agency and the London School of Hygiene and Tropical Medicine.
Britain does not emerge well from one such ranking, compiled by Ellen Nolte and Martin McKee of the London School of Hygiene and Tropical Medicine.
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Andrew Prentice, professor of international nutrition at the London School of Hygiene and Tropical Medicine, reckons that the thrifty gene is widespread among the human race.
Dr Nicholas Casewell, an expert in snake venom at the Liverpool School of Tropical Medicine, has recently highlighted the potential of venom as a drug source.
Professor Brian Greenwood, of the London School of Hygiene and Tropical Medicine, agreed that the study would help scientists better to understand the immune response to malaria.
"We understand there could be global risks associated with the current outbreak, " said study author Dr. Isaac Bogoch, a specialist in infectious diseases and tropical medicine at the University of Toronto.
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The following year he was appointed to the Sir Alfred Jones Chair of Tropical Medicine at the University of Liverpool, and became Professor of Tropical Medicine at the university.
The results of a study conducted in Belgium, at the Institute of Tropical Medicine in Antwerp, seem to suggest that in one corner of the world it might be.
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However, Simon Cousens, an epidemiologist at the London School of Hygiene and Tropical Medicine, points out that such a pattern does not necessarily mean a disease outbreak is levelling off.
Dr Delmiro Fernandez-Reyes, head of the division of parasitology at London's National Institute for Medical Research, welcomed the research, presented at American Society of Tropical Medicine and Hygiene meeting in New Orleans.
To find out more, researchers from the London School of Hygiene and Tropical Medicine took some A. aegypti mosquitoes in the laboratory, and tempted them with a human arm covered in Deet.
"In the past, doctors used to try all kinds of strange things to try to treat lung infections, " said Dr. Jennifer Quint, a respiratory expert at London's School of Hygiene and Tropical Medicine.
Andrew Prentice, a professor of nutrition at the London School of Hygiene and Tropical Medicine, suggested this week that obesity is now so widespread (hem) that it represents an evolutionary shift in human body-shape.
Commenting on the study, Professor Anne Mills, from the London School of Hygiene and Tropical Medicine in the UK, said that external funding may be low because a country may be funding its own malaria programmes.
Until recently, doctors have had neither a decent test for ciguatera, or a treatment, but Dr Ritchie Shoemaker told the annual meeting of the American Society for Tropical Medicine and Hygiene both may be on the horizon.
Professor Alexander Trees and his team from the Liverpool School of Tropical Medicine and the University of Liverpool's faculty of veterinary science, found that killing bacteria which are abundant in the worm tissues leads to its death.
Dr Dianna Lockwood, a leprologist at the London School of Hygiene and Tropical Medicine, said the findings were interesting and that certainly a person with both TB and leprosy was more likely to die from the TB.
Researchers at the London School of Hygiene and Tropical Medicine have also launched The Flu Survey, which has recruited volunteers from 10 European countries to report symptoms and provide weekly updates of the spread of flu across the continent.
But researchers, such as Michael Coleman at the London School of Hygiene and Tropical Medicine, argue that consent and anonymisation are not always possible, and that without access to data, work that is in the public interest will stop.
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Dr Ruth McNerney, of the London School of Hygiene and Tropical Medicine, told The Associated Press that the instrument has the potential to infect those seated near a person blowing a vuvuzela because a "lot of breath goes through" it.
Dr Sarah Walters, lead author from the Cancer Research UK Cancer Survival Group at the London School of Hygiene and Tropical Medicine, said the reasons for low overall survival in the UK and Denmark were different and needed different solutions.
One of the report's lead authors, Professor Michel Coleman, of the London School of Hygiene and Tropical Medicine, said it was important to look at the overall pattern of survival rates to build up a clear picture of what is going on.
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