News / Health

US Reports Record Outbreak of West Nile Virus

Carol Pearson
The United States has just had its worst year ever for West Nile virus, according to the Centers for Disease Control and Prevention.  As of September 11, more than 2,500 cases have been reported and 118 people have died from the ailment.
 
West Nile virus is now endemic to the United States.  The seasonal epidemic flares up around June and continues until about October.
 
Dr. Lyle Peterson of the U.S. Centers for Disease Control and Prevention says there have been more than 2,500 cases of the mosquito-born disease so far this year.  "The number of people who have become ill with West Nile virus disease continues to go up and we expect the virus to continue until October," he said.
 
The virus has been reported in every state except Alaska and Hawaii.  But Peterson, who heads the CDC’s division of vector-born infectious diseases, says most of the cases have occurred in just a handful of states. "Two-thirds of all cases have been reported from six states: Texas, Louisiana, South Dakota, Mississippi, Michigan and Oklahoma.  And 40 percent have been reported from Texas," he said.
 
The CDC reports that most people who contract the virus will have no symptoms, but some will go on to develop West Nile neuroinvasive disease.  In these cases, patients can have seizures, muscle weakness and paralysis.  The disease can be fatal. 
 
Peterson said the number of neuroinvasive cases is the highest to date since the virus was first detected in the United States 13 years ago. “Of the 2,636 cases, 1,405 or 53 percent were classified as neuroinvasive disease such as meningitis or encephalitis."  
"We consider the number of neuroinvasive disease to be the best indicator of the scope of the epidemic since these cases are most consistently reported," he said.
 
Although the number of cases is up 35 percent from last week, Peterson suggests the worst is over. "We've turned the corner on the epidemic.  West Nile virus outbreaks in the United States tend to peak in mid to late August," he said.
 
That's when days get shorter and mosquitos become less active.
 
While the West Nile virus will soon go dormant, scientists will be analyzing data to find out why it was so virulent in Texas. They will look at factors that include the number of mosquitos in an area, how fast the virus replicates in the mosquitos, and they'll also look at climate.
 
"There's a very complicated relationship of temperature and rainfall and all of these factors in West Nile virus transmission," said Peterson.
 
So far, scientists have not been able to figure out how those relationships help the virus spread.  Peterson says it may take several more years before they uncover the clues.  
 
In the meantime, there is no vaccine to protect people from this sometimes deadly illness.

You May Like

Video Analysts: Beijing Parade a 'Bazaar' of Stolen Technology

Show commemorating victory over Japan in World War II involved long, medium and short range missiles, a range of tanks and 200 fighter aircraft More

Bernie Sanders Surge Reflects US Shift on Socialism

Although most analysts say it is unlikely he will get the Democratic nomination, Sanders' campaign opens up questions and issues that are otherwise marginalized More

Video On IS Frontline, Kurdish Fighters Ready for Offensive

Peshmerga soldiers say although they need more heavy artillery, they are poised to take the fight to the Islamic State extremists on their turf More

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
Drowned Migrant Toddler Photo Triggers European Outragei
X
Henry Ridgwell
September 04, 2015 11:36 AM
The harrowing picture of a drowned three-year-old Syrian boy washed up on a Turkish beach appears to have galvanized Europe’s leaders into doing more to address the refugee crisis. France, Germany and Italy issued a joint call Thursday for compulsory quotas of refugees for all EU states. But there were chaotic scenes in Hungary as police tried to force migrants off a train heading for Austria. Henry Ridgwell has more. And a caution, some of the images in this report may be disturbing.
Video

Video Drowned Migrant Toddler Photo Triggers European Outrage

The harrowing picture of a drowned three-year-old Syrian boy washed up on a Turkish beach appears to have galvanized Europe’s leaders into doing more to address the refugee crisis. France, Germany and Italy issued a joint call Thursday for compulsory quotas of refugees for all EU states. But there were chaotic scenes in Hungary as police tried to force migrants off a train heading for Austria. Henry Ridgwell has more. And a caution, some of the images in this report may be disturbing.
Video

Video Russians Observe 11th Anniversary of Beslan School Attack

This week, Russians have been observing the 11th anniversary of the attack by Islamic militants on a school in Russia's North Caucasus region that killed more than 330 hostages, including 186 children. The three-day siege and massacre that started on September 1, 2004 took place in Beslan, a town in the republic of North Ossetia, and is one of the bloodiest terrorist acts ever in Russia. VOA's Mike Richman reports.
Video

Video Native Americans Debate: Father Serra, Saint or Sinner?

Pope Francis will canonize an 18th century missionary to Spanish California during a papal visit to the United States this month.  But some Native Americans have criticized the elevation to sainthood of the missionary priest, Junipero Serra. VOA's Mike O’Sullivan has more from Los Angeles.
Video

Video Calais School Offers Another Face of Europe’s Migrant Crisis

Europe is facing mounting criticism over how it’s handling its biggest migration crisis since World War II. But not all Europeans believe building walls or passing repressive policies are the answer. A school for migrants in the French port city of Calais, is opening doors and building bonds across nationalities. VOA's Lisa Bryant reports.
Video

Video Kurdish Fighters on IS Frontline Ready for Offensive

Finger on the trigger, the Kurdish Peshmerga soldier stared across the dust at a village taken over by Islamic State extremists. The Kurdistan’s Khazir frontline, just 45 minutes from the Islamic State stronghold of Mosul. And at this point, the militants were less than two kilometers away. VOA's Sharon Behn reports.
Video

Video China Announces Troop Cuts at WWII Parade

Chinese President Xi Jinping Thursday announced plans to cut the world’s largest military force by 300,000 troops. The announcement was made during a massive military parade to commemorate victory over Japan in World War II. The event was shunned by most Western leaders and for some is raising fresh concerns about China’s military ambitions. VOA’s Bill Ide has more from Beijing.
Video

Video Russia-Japan Relations Cool as Putin Visits China for WWII Anniversary

Russian President Vladimir Putin is in Beijing for commemorations of the 70th anniversary of China's WWII victory over Japan. Putin is expected to visit Japan later this year, but tensions between Tokyo and Moscow over islands disputed since the war, and sanctions over Ukraine, could pour cold water on the plan. VOA's Daniel Schearf reports.
Video

Video Yemen ‘on Brink of Disaster’ as Medical Shortages Soar

Aid agencies warn Yemen is on the brink of humanitarian disaster – with up to half a million children facing severe malnutrition, and hospitals running out of basic medicines. There are fears Yemen's civil war could escalate as the coalition led by Saudi Arabia tries to drive back Houthi rebels, who seized control of much of the country earlier this year. Henry Ridgwell reports.
Video

Video Apps Helping Kenyan Businesses Stay Ahead of Counterfeiters

Counterfeit goods in Kenya cost the government as much as $1 billion each year in lost tax revenues. The fake goods also hurt entrepreneurs who find it hard to carve out a niche in the market and retain customers. But as Lenny Ruvaga reports from Nairobi, information technology is being used to try to beat the problem.
Video

Video Nobel Prize Winner Malala Talks to VOA

Nobel Peace Prize winner Malala Yousafzai met with VOA's Deewa service in Washington Sunday to talk about women’s rights and unveil a trailer for her new documentary. VOA's Katherine Gypson has more.
Video

Video War, Drought Threaten Iraq's Marshlands

Iraq's southern wetlands are in crisis. These areas are the spawning ground for Gulf fisheries, a resting place for migrating wildfowl, and source of livelihood for fishermen and herders. Faith Lapidus has more.
Video

Video Colombians Flee Venezuela as Border Crisis Escalates

Hundreds of Colombians have fled Venezuela since last week, amid an escalating border crisis between the two countries. Last week, Venezuelan President Nicolas Maduro ordered the closure of a key border crossing after smugglers injured three Venezuelan soldiers and a civilian. The president also ordered the deportation of Colombians who are in Venezuela illegally. Zlatica Hoke reports.
Video

Video Rebuilding New Orleans' Music Scene

Ten years after Hurricane Katrina inundated New Orleans, threatening to wash away its vibrant musical heritage along with its neighborhoods, the beat goes on. As Bronwyn Benito and Faith Lapidus report, a Musicians' Village is preserving the city's unique sound.
Video

Video In Russia, Auto Industry in Tailspin

Industry insiders say country relies too heavily on imports as inflation cuts too many consumers out of the market. Daniel Schearf has more from Moscow.
Video

Video Scientist Calls Use of Fetal Tissue in Medical Research Essential

An anti-abortion group responsible for secret recordings of workers at a women's health care organization claims the workers shown are offering baby parts for sale, a charge the organization strongly denies. While the selling of fetal tissue is against the law in the United States, abortion and the use of donated fetal tissue for medical research are both legal. VOA’s Julie Taboh reports.

VOA Blogs