SCIENCE IN THE NEWS - U.S. Doctors Separate Guatemalan Siste

（单词翻译）

SCIENCE IN THE NEWS -August 20, 2002: U.S. Doctors Separate Guatemalan Sisters Joined at the Heath /
West Nile Virus Spreads in the United States

Broadcast:

VOICE ONE:

This is Ray Freeman.

VOICE TWO:

And this is Bob Doughty¹ with Science in the News, a VOA Special English program about recent developments
in science. Today, we tell about an operation that separated twin babies joined at the head. And we tell about the
spread of West Nile virus in the United States.

((THEME))

VOICE ONE:

Earlier this month, doctors in California separated two baby sisters joined at the top of the head. A large
operating team successfully divided the head bones and skin of Maria Teresa (mah-REE-ah teh-RAY-sah) and
Maria de Jesus Quiej-Alvarez (mah-REE-ah deh hay-SOOS key-ek-AHL-veh-rez). The doctors also
disconnected and re-directed some of the girls’blood vessels³.

This operation on the one-year-old twins took twenty-two hours. A few hours later, doctors operated on one of
the babies to stop bleeding on the brain. Doctors performed the operations at the Mattel Children’s Hospital at the
University of California at Los Angeles. The two Marias were born in Belen (beh-LEHN), Guatemala, with their
heads joined at the top. The babies faced opposite directions.

Experts say this condition is extremely rare. Only about one in two-and-one-half-million live births results in
twins being joined at the head. It is one of the rarest examples of conjoined or connected twins. Normal twins
who are exactly alike result when a fertilized⁴ egg separates into two embryos⁵ early in the mother’s pregnancy⁶.
Twins become connected when a fertilized egg fails to completely separate.

VOICE TWO:

At least fifty medical experts took part in the operation on the Guatemalan babies. To separate the sisters’heads,
the doctors had to disconnect blood vessels that the babies shared. However, the twins did not share a major vein⁷
called the sagittal (SAJ-it-al) sinus. This vein passes over the top of the skull⁸ from the front to the back. Then it
divides to take blood back to the heart.

Doctors said the fact that each girl had her own sagittal sinus was very good news. It meant the doctors did not
have to decide which twin would get the vein, or try to build one vein for each child.

The babies did share some bone structure. Each, however, had a separate brain. In the future, the doctors say they
will have to rebuild areas around the girls’brains and skulls⁹. This operation will make their heads appear more
normal.

VOICE ONE:

Doctors were pleased that the girls were moving their hands and feet after the operation. The babies also were
looking around and reacting to their nurses. However, it will not be known for some time if either or both
suffered brain damage.

A group in Spokane, Washington, called Healing the Children, brought the babies and their parents to Los
Angeles for the operation. The girls’parents decided¹⁰ on the operation to separate the twins after being told their


babies might not survive without it.

Most twins connected at the head die. Between forty and fifty cases of twins joined this way have been reported
over the years. Only about fifteen percent lived to age five. Only one set grew up to become adults. Organ failure
usually causes the deaths. The heart and kidneys of one twin carry most of the responsibility for both bodies.
When the organs fail, both twins die.

In the past, about thirty operations were performed to separate twins joined at the head. Most of the babies
suffered brain damage. Half of them died.

VOICE TWO:

Two other conjoined twin girls were separated in an operation in Baltimore, Maryland, in April. These babies
were joined at the chest. Doctors at the University of Maryland Medical Center operated on Loice (low-EES) and
Christine Onziga (kris-TEEN ahn -ZEE-gah). The babies were born in October of last year in Leiko, (LAY-co) a
village in northern Uganda.

The twins shared a liver. First, the doctors separated that organ. Then they temporarily tied off a blood vessel² that
connected the babies’hearts. The doctors were extremely pleased to see that each heart could beat independently.
This permitted them to cut the blood vessel. Each girl was left with a small opening in her heart. Doctors say they
can repair this without further surgery.

The doctors also rebuilt part of the walls of the twins’chests and abdomens¹². And, they rebuilt part of the
muscular tissue that separates the abdomen¹¹ and chest. Loice and Christine now appear to be developing normally.
They are expected to return to Uganda with their parents in October if they continue to do well.

VOICE ONE:

Years ago, connected twins were called “Siamese twins.”This was because the first well known joined twins
were born in Siam, now called Thailand. The twins, Chang and Eng, were born to Chinese parents in eighteen-
eleven. A narrow piece of skin joined their lower chests. Their livers were connected through that skin. Chang
and Eng grew up and married sisters in the eighteen -forties. Over the years, the two became fathers of twenty -one
children. Several times during their lives, Chang and Eng considered separation surgery. But they decided against
it. They died in eighteen-seventy-four.

((MUSIC))

VOICE TWO:

A viral disease is infecting people in many parts of the United States. By the end of
last week, the West Nile virus had killed at least nine people. It has infected more
than one-hundred-sixty people in at least twelve states and the District of Columbia.
The virus has been discovered in at least thirty-eight states in horses, birds or
mosquito insects.

Health officials say West Nile virus is spread by mosquitoes that feed on the blood
of infected birds and then bite people. Recently, the director of the Centers for
Disease Control said Americans will have to deal with the virus for a long time.
Julie Gerberding said the virus is well established among populations of birds and mosquitoes in this country.

However, the time of year of the current outbreak has concerned health officials. Doctor Gerberding noted¹³ that
people developed West Nile virus in August and September in the past. Yet, this current outbreak began in June.
It appears to be getting worse at the time when the disease usually begins.

VOICE ONE:

West Nile virus was first observed in the West Nile area of Uganda in nineteen-thirty-seven. Forms of the virus
have appeared in recent years in widely separated countries. In the nineteen-nineties, the disease was reported in
Algeria, Romania, the Czech Republic, the Democratic Republic of Congo, Russia, the United States, France and
Israel.


West Nile virus was first reported in the United States in nineteen-ninety-nine. That outbreak in New York City
killed seven people. It also caused more than sixty people to seek treatment in hospitals. The virus has been
spreading to other states since then.

West Nile virus is one of a group of viruses that can cause high body temperature and pain. The viruses can also
affect the senses and balance of a person. It is among a group of organisms called flavi-viruses
(FLAY.vi.vie.rus.es). The disease Japanese encephalitis is similar to West Nile virus.

VOICE TWO:

Only about one in five people who are infected with the virus become sick. Signs of the disease include muscle
aches, pain in areas where bones are joined, high body temperature, headache and tiredness.

West Nile virus can cause serious disease or death among older people and people whose defense¹⁴ system against
disease is weakened. It can cause encephalitis, an inflammation of the brain. It can also cause meningitis,
inflammation of tissues around the brain or spinal¹⁵ cord. However, fewer than one percent of people infected with
the virus become seriously sick.

VOICE ONE:

John Barry is a biology researcher. He wrote in the New York Times newspaper that the current outbreak is not
really unusual. He noted that a virus closely related to West Nile virus, called Saint Louis encephalitis, infected
about two-thousand people in nineteen-seventy-five. It then almost disappeared.

Lyle Petersen of the Centers for Disease Control also noted that the hot summer weather may have caused an
increase in the viral infections. Warm temperatures make it possible for mosquitoes to reproduce more
effectively.

Cases of West Nile virus are expected to decrease as autumn comes and temperatures drop. Several experts say it
may take years before they understand the development of the disease in this country.

((THEME))

VOICE TWO:

This SCIENCE IN THE NEWS program was written by Jerilyn Watson and Mario Ritter. It was produced by
George Grow. This is Bob Doughty.

VOICE ONE:

And this is Ray Freeman. Join us again next week for more news about science in Special English on the Voice
of America.

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