Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: 
  
 Eritania Maria, who was six months pregnant, is seen in front of her house at a slum in Recife, Brazil, on Feb. 2, 2016. (Reuters/Ueslei Marcelino) 
  
 Scientists have discovered that three existing drugs — used for cancer, hepatitis C and for parasitic infections — appear to be promising against the Zika virus. 
  
 The experiments that led to the discovery were conducted only in lab-grown human cells in petri dishes, but the results were dramatic. Zika is so devastating that the damage it does has been thought to be irreversible. But the researchers said some of the tested compounds allowed cells not only to live longer in the face of infection but also in some cases to fully recover. 
  
 The news, reported in Nature Medicine on Monday, is an exciting but only a very preliminary step toward a treatment. The researchers will have to test the drugs in animal models to see if they can replicate the results. If these tests are successful, they will have to start the long process of testing the drugs’ effectiveness in humans. 
  
 [U.S. warning: Zika could spread to Gulf states, persist for one to two years] 
  
 Co-author Hongjun Song, director of the stem cell program at Johns Hopkins, said that the drugs “are very effective against Zika in the dish, but we don’t know if they can work in humans in the same way.” 
  
 He said, for instance, that it’s unknown whether niclosamide, which is used to treat patients with parasites in the gut, can even penetrate the central nervous system to get to an unborn baby’s brain. 
  
 The researchers also don’t have any idea whether the drugs could treat the whole spectrum of damage done by the virus, from microcephaly (abnormally small heads) in infants to paralysis of the gastrointestinal tract. Scientists also have not yet determined whether the drug can treat the brain cells targeted by Guillain-Barré syndrome, one of the results of Zika infection in adults. 
  
 The identification of the drugs was based on a large-scale screening of 6,000 drugs. Given that it can take decades for scientists to come up with and test medications, looking at those that are already approved by regulators or in clinical trials can cut the development time a great deal. This technique has also been used in the hunt for an Ebola treatment. 
  
 [Heartbreaking images show how Zika destroys babies' brains] 
  
 The three drugs identified are PHA-690509, which is investigational and is being used on cancer patients; emricasan, which is being used in clinical trials to determine whether it might be able to help reduce liver damage from the hepatitis C virus; and niclosamide. 
  
 The experiments were conducted in what the researchers described as “two- and three-dimensional cell cultures called ‘mini-brains,’ ” which share some structures with the human brain. They measured indicators of cell death and found that there seemed to be two classes of drugs with potential to help stop or hinder the virus. The first group includes neuroprotective drugs, which might stop cell death, and antiviral drugs, which might slow or stop infection or replication of the virus in the brain. 
  
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 Like our Health & Wellness page on Facebook for more science news about the ins and outs of the human body and mind, essays and advice. You can sign up here for our newsletter. ||||| Babies born with microcephaly are under treatment in the Intensive Care Unit of the South Hospital in Choluteca, Honduras. (Photo: ORLANDO SIERRA, AFP/Getty Images) 
  
 Doctors are now adding hearing loss to the growing list of health problems linked to Zika infections in babies. 
  
 The virus is already known to cause microcephaly, a condition in which babies are born with abnormally small heads and incomplete brain development, among other serious health problems. 
  
 In a study of 69 Zika-infected babies with severe microcephaly, about 6% showed hearing loss, according to a study from Centers for Disease Control and Prevention released Thursday. 
  
 The babies were born between November and May and were treated at the Hospital Agamenon Magalhaes in Recife, Brazil, the city at the epicenter of the Zika outbreak in that country. 
  
 A number of other viruses are known to cause hearing loss in babies infected prenatally. These viruses include rubella, also known as German measles; genital herpes; syphilis; and cytomegalovirus, a type of herpes virus. Each of these can also cause microcephaly. 
  
 If the hearing loss caused by Zika follows the same pattern seen in these other viral infection, the hearing loss will be permanent, said James Bale, Jr., professor of pediatric neurology at the University of Utah School of Medicine, who was not involved in the study. Children will need a range of services, including hearing and speech therapy, hearing aids and cochlear implants, surgically implanted devices can help to provide a sense of sound to a person who is profoundly deaf or severely hard-of-hearing. 
  
 Authors of the new study say babies with suspected Zika exposure should undergo hearing tests, even if their hearing screenings at birth appear normal. That's because other viruses known to cause hearing loss in babies can be delayed, with hearing loss getting worse over time. 
  
 Zika infections rarely harm adults, causing no symptoms in 80% of those infected. The other 20% of people who are infected develop mild symptoms, such as fever, a rash, headache, aches and pains and pink eye, lasting about a week and going away without any treatment, said Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases. 
  
 In rare cases, Zika can cause neurological problems in adults, including Guillain-Barre syndrome, in which the immune system attacks the nerves of the body, causing paralysis. This syndrome can be caused by many viruses, including the flu. 
  
 Zika generally doesn't affect mature brain cells, such as those found in children and adults. But studies show the virus clearly hones in on developing brain cells, such as those in the fetus, Fauci said. In the new Brazilian studies, all of the babies developed a type of hearing loss caused by nerve damage. 
  
 Yet the news about Zika's effects on babies grows worse with nearly every new study. Fauci notes that the full spectrum of Zika's effects on children may become apparent only in coming years, as children mature. 
  
 "Microcephaly may be just the tip of the iceberg," Fauci said. 
  
 Researchers in recent months have documented the catastrophic brain damage suffered by some infants infected with Zika in the womb. Babies with prenatal Zika infections also have been diagnosed with severe joint deformities and vision loss. 
  
 Zika appears to be most destruction in early pregnancy, when the fetal brain is undergoing tremendous growth, Fauci said. A study released last week, however, showed that even babies infected in late pregnancy can suffer serious problems. 
  
 In that case, a baby boy was infected in the 26th week of pregnancy. A typical pregnancy lasts 40 weeks. The baby appeared healthy at birth, although his head was very small. By the time he was 6 months old, however, he had developed very tight muscles and was paralyzed on one side of his body. 
  
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Output:
The good news: Three drugs that already exist appear to be successful at fighting the Zika virus. The bad news: Scientists aren't yet sure if the drugs will actually work on humans who have the Zika virus, the Washington Post reports. The drugs—PHA-690509, a drug currently being tried on cancer patients; emricasan, a drug currently being tried on patients with liver damage from hepatitis C; and niclosamide, which is used for gut parasites—"are very effective against Zika in the [petri] dish, but we don’t know if they can work in humans in the same way," says the co-author of the study that led to the discovery. The study, which screened 6,000 existing drugs, used the drugs on lab-grown human cells; the three aforementioned drugs allowed those cells to live longer when faced with Zika infection—and sometimes even recover completely, though Zika damage was previously thought to be impossible to reverse. The next step is to test the drugs in animal models, then, if the results are replicated, test them on humans. Meanwhile, in addition to the problems Zika is already linked to in unborn babies, USA Today reports that the virus is now also linked to hearing loss.