World Health Organization officials say it could be months before a vaccine is available to treat this latest strain of flu.

VOA: standard.2009.04.28

Port-au-Prince was overcrowded before the earthquake. The mass exodus from the capital presented an opportunity to relieve the strain.

VOA: standard.2010.07.16

Meanwhile,expedited efforts are going forward on several continents to develop an effective vaccine for the new strain of influenza.

VOA: standard.2009.04.30

"We had a new strain of flu. We did not really know that its lethality was going to be.

VOA: standard.2009.05.03

Each year,scientists work to develop a unique influenza vaccine to protect people against the strain expected in the coming flu season.

VOA: standard.2010.07.21

The airing of the controversial program caused outrage in Tel Aviv and is the latest strain on relations between the two countries.

VOA: standard.2009.10.27

"The candidates were feeling the strain and the audience felt a kind of sense of excitement that I would not have anticipated."

VOA: standard.2010.04.22

(Speaking) But a study at the University of California Berkeley found that 3-D movies can cause eye strain.

VOA: standard.2010.02.21

Critics say many public health facilities already are under strain and fear more professionals will abandon the public system for private practice.

VOA: standard.2009.12.23

But the current swine flu is a new strain to which humans have no immunity and against which existing vaccines offer no protection.

VOA: standard.2009.04.30

But he says it is cause for concern because it is a new strain, and people have not built up an immunity to it.

VOA: standard.2009.05.01

The speed and magnitude of the crisis surprised the government and aid agencies and has put an enormous strain of their ability to provide assistance.

VOA: standard.2009.07.03

Environmentalists are trying to encourage Sierra Leone's salt producers to use other methods, including drying salt in the sun, to reduce the strain on mangroves.

VOA: standard.2010.03.29

Hundreds of millions braved the cold winter weather to travel home to be with their families, putting a great strain on the country's transport system.

VOA: standard.2010.02.14

"This is a new strain of stem rust organism that has the power to destroy most of the wheat varieties being grown around the world."

VOA: standard.2009.09.16

The growing demand for meat and dairy products is putting particular strain on the environment.

VOA: standard.2010.06.04

Mexico has the highest number of deaths and infections of the flu, which is caused by a new strain of the influenza A H1N1 virus.

VOA: standard.2009.05.08

It is another strain on the economic life of this country."

VOA: standard.2009.09.05

The flood of people put tremendous strain on their hosts.

VOA: standard.2010.07.16

And a severe strain of dysentery has claimed 30 lives.

VOA: standard.2009.09.14

It's a virulent strain that occurs when a person with TB fails to complete the six to nine-month course of medication or catches TB from another person who is ill with a drug resistant-strain.

VOA: standard.2010.07.12

"The target would be to have this vaccine ready for the fall flu season, so that in addition to being vaccinated for the flu, you would be able to be vaccinated for this strain.

VOA: standard.2009.04.30

This is welcome news for U.S.health officials, who initially had to consider the possibility that the new flu strain's impact could mirror the devastation of the 1918 influenza pandemic that led to tens of millions of deaths worldwide.

VOA: standard.2009.05.03

Since a vast majority of the refugees are Sunni Muslims, Christian leaders fear such a large influx of citizens could tilt the sectarian balance, as well as increase competition in the job market and strain Lebanon's economic resources.

VOA: standard.2010.06.29

To slow the spread of the virus and relieve the strain on the country's health system, the government has set up a national pandemic flu service, where people who suspect they're infected can get a diagnosis and prescription for antiviral drugs over the phone or Internet.

VOA: standard.2009.07.31