Navigation Links
Researchers Find Surprising Pattern of Influenza Spread in South,America and Tropics

BETHESDA, Md., March 20, 2007--Researchers studying influenza transmission patterns in the Southern Hemisphere and in tropical areas, specifically Brazil, uncovered the unexpected finding that each season influenza travels from low populated regions near the equator to the more populated centers. Their work, funded by the Fogarty International Center (NIH), part of the National Institutes of Health (NIH), can improve planning for influenza control in tropical areas.

In their paper, "Seasonality of Influenza in Brazil: A Traveling Wave from the Amazon to the Subtropics," to be published in the American Journal of Epidemiology, the researchers document the seasonal spread of influenza viruses and seasonal mortality patterns associated with influenza across Brazil. The interest in Brazil arises because the country covers a range of latitudes and crosses several regions, including tropical and sub-tropical climates.

"This study contributes to the understanding of the role of tropical regions in the global circulation of influenza. It has direct implications for public health by offering guidance for the timing of delivery and composition of influenza vaccines," said Dr. Mark Miller, a co-author and Associate Director for Research at FIC.

As epidemic months of influenza in Brazil are triggered earlier in the year in the equatorial regions, vaccine recommendations using formulations from the Northern Hemisphere could be more appropriate for some countries in the Southern Hemisphere near the equator. This point is becoming increasingly important as more tropical countries introduce and use substantial quantities of vaccine.

Brazilian investigators worked with colleagues at FIC and the National Institute of Allergy and Infectious Diseases (NIAID) in revealing the unexpected spatial transmission patterns in the annual seasonality of influenza across a large area of the South American continen t.

Brazil is nearly the same size as the United States. However, most of Brazil's territory lies in the tropical belt. This aspect makes the study valuable since less is known about the circulation of influenza viruses at these latitudes and how epidemics bridge and annually alternate between both hemispheres following the winter seasons.

Given the range of latitude encompassed by Brazil which crosses the equatorial and the southern tropic lines and using sophisticated mathematical analytical tools, the researchers studied the mortality data of influenza and pneumonia from two decades, together with laboratory confirmed data from recent years.

Both sets of independent data sources converged to show that, surprisingly, in Brazil influenza epidemics do not spread from where the highest human population densities are found, but rather from the equator towards more populous regions of the Southeast and South of Brazil.

The study, supported by FIC, results from a collaboration among researchers in different parts of the world. Study authors are Wladimir J. Alonso (FIC), Cécile Viboud (FIC), Lone Simonsen (NIAID), Eduardo W. Hirano (Mechanical Engineering Department, Universidade Federal de Santa Catarina, Florianópolis, Brazil), Luciane Z. Daufenbach (Secretariat of Health Surveillance, Ministry of Health, Brasília, Brazil), and Mark A. Miller (FIC).

FIC <http://www.fic.nih.gov>, the international component of the NIH, addresses global health challenges through innovative and collaborative research and training programs and supports and advances the NIH mission through international partnerships.

NIAID <http://www.niaid.nih.gov> is a component of the National Institutes of Health. NIAID supports basic and applied research to prevent, diagnose and treat infectious diseases such as HIV/AIDS and other sexually transmitted infections, influenza, tuberculosis, malaria and illness from potential agents of bioterrorism. NIAID also supports research on basic immunology, transplantation and immune-related disorders, including autoimmune diseases, asthma and allergies.

The National Institutes of Health (NIH) -- The Nation's Medical Research Agency -- includes 27 Institutes and Centers and is a component of the U. S. Department of Health and Human Services. It is the primary federal agency for conducting and supporting basic, clinical, and translational medical research, and it investigates the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit <http://www.nih.gov>.

###

CONTACT: Henry Francis, M.D., 301-496-6689, hfrancis@mail.nih.gov>

U.S. Department of Health and Human Services NATIONAL INSTITUTES OF HEALTH NIH News Fogarty International Center (FIC) <http://www.fic.nih.gov>


'"/>




Related medicine technology :

1. NIEHS Researchers Identify Enzyme Critical in DNA Replication
2. Stanford Researchers Find Brain Pathway of Depression in Rats
3. Researchers Discover Method for Identifying How Cancer Evades the Immune System
4. Researchers Discover Gene For Rare Skin Disorder
5. Prolexys Pharmaceuticals and Columbia University Researchers Publish Study on Anti-Tumor Properties of a Selective Small Molecule Anti-Tumor Agent With Novel Mechanism of Action
6. NCI Researchers Discover Genes That Are Turned on at High Levels in Tumor-associated Blood Vessels of Mice and Humans
7. Stanford Researchers Track Human Stem Cells Transplanted Into Rat Brain
8. Dasatinib Shows High Early Response Rate as First Treatment for Chronic Myelogenous Leukemia, M. D. Anderson Researchers Report
9. World First Medical Treatment Announced by Researchers at Queen Mary University London and University of Leicester
10. Researchers Urge Caution in Using ESAs for Cancer-Related Anemia
11. Researchers Identify New Genetic Risk Factors for Type 2 Diabetes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/15/2017)... HOUSTON , Aug. 15, 2017   Mostyn Law ... in Houston, Texas . The Mostyn Law ... the past 2 years. That is why Mostyn Law ... Texas to show its appreciation. Blood supplies ... to fall 5% short of hospital needs in August. That is ...
(Date:8/15/2017)... , Aug. 15, 2017  Axium Pharmaceuticals Inc., the creator of ... to be in the beginning stages of an IPO. ... epilepsy medications with the average cost of a prescription epilepsy drug being ... AXIUM ... Another staggering figure is the fact that ...
(Date:8/15/2017)... announced today that its fully owned USA -operating ... City Office in Yonkers, New York to ... 2 ) homecare therapy. This new East Coast location has also ... the company,s DMEPOS accreditation for Home/Durable Medical Equipment Services. ... Advanced Oxygen Therapy Inc. New York ...
Breaking Medicine Technology:
(Date:8/21/2017)... (PRWEB) , ... August 21, 2017 , ... FCPX LUT ... Editors can quickly and easily add washed color grades to footage. A LUT ... LUT changes every pixel’s color to the corresponding color indicated by the table. This ...
(Date:8/21/2017)... , ... August 21, 2017 , ... ... recognized community involvement program serving the people of Michigan. The new initiative fundraises ... 120 years at the very forefront of animal protection and welfare by addressing ...
(Date:8/21/2017)... San Diego, CA (PRWEB) , ... August 21, 2017 , ... ... Membership ( MAM ) health care reform plan, has announced his candidacy for the ... the American Dream and shared in America’s Promise. Coming to this country at age ...
(Date:8/20/2017)... ... August 20, 2017 , ... HIPAA Solutions, LC ... has assisted multiple clients in successfully passing audits such as Office of Civil ... (AICPA SOC Level 2), and State Data Use Agreement Audits. , HIPAA ...
(Date:8/19/2017)... Calif. (PRWEB) , ... August 18, 2017 , ... Western ... in health and education to launch the University’s new Center for Innovation on Wednesday, ... WesternU Health Education Center Lecture Hall 1, followed by a technology exhibition from 1 ...
Breaking Medicine News(10 mins):