You will be shown a claim about public health, and the abstract of a biomedical research paper. Each sentence from the abstract will be on a separate line. Your task is to return a JSON object with two fields:

- "verdict": The fact-checking verdict. If the information in the abstract supports the claim, write "SUPPORT". If the abstract contradicts the claim, write "CONTRADICT". If the abstract does not provide enough information to arrive at a verdict, write "NEI" (for "not enough information").
- "evidence": An array of sentences providing evidence for the verdict. Please copy all relevant sentences verbatim from the abstract. If the verdict was "NEI", then return an empty array.

For instance, if the model were given the claim "wearing masks can prevent the spread of COVID", the output might be
{
  "verdict": "SUPPORT",
  "evidence": ["Our findings indicate that mass mask-wearing reduces the transmission rate for COVID-19."]
}

Claim: One reason Covid-19 has spread so rapidly is that people infected with the SARS-CoV-2 coronavirus can show no symptoms of disease and yet are still contagious - they don't look or feel sick but still transmit the virus without realizing.

Abstract:
Background: Previous studies have showed clinical characteristics of patients with the 2019 novel coronavirus disease (COVID-19) and the evidence of person-to-person transmission.
Limited data are available for asymptomatic infections.
This study aims to present the clinical characteristics of 24 cases with asymptomatic infection screened from close contacts and to show the transmission potential of asymptomatic COVID-19 virus carriers.
Methods: Epidemiological investigations were conducted among all close contacts of COVID-19 patients (or suspected patients) in Nanjing, Jiangsu Province, China, from Jan 28 to Feb 9, 2020, both in clinic and in community.
Asymptomatic carriers were laboratory-confirmed positive for the COVID-19 virus by testing the nucleic acid of the pharyngeal swab samples.
Their clinical records, laboratory assessments, and chest CT scans were reviewed.
Findings: None of the 24 asymptomatic cases presented any obvious symptoms before nucleic acid screening.
Five cases (20.8%) developed symptoms (fever, cough, fatigue and etc.) during hospitalization.
Twelve (50.0%) cases showed typical CT images of ground-glass chest and five (20.8%) presented stripe shadowing in the lungs.
The remaining seven (29.2%) cases showed normal CT image and had no symptoms during hospitalization.
These seven cases were younger (median age: 14.0 years; P = 0.012) than the rest.
None of the 24 cases developed severe COVID-19 pneumonia or died.
The median communicable period, defined as the interval from the first day of positive nucleic acid tests to the first day of continuous negative tests, was 9.5 days (up to 21 days among the 24 asymptomatic cases).
Through epidemiological investigation, we observed a typical asymptomatic transmission to the cohabiting family members, which even caused severe COVID-19 pneumonia.
Interpretation: The asymptomatic carriers identified from close contacts were prone to be mildly ill during hospitalization.
However, the communicable period could be up to three weeks and the communicated patients could develop severe illness.
These results highlighted the importance of close contact tracing and longitudinally surveillance via virus nucleic acid tests.
Further isolation recommendation and continuous nucleic acid tests may also be recommended to the patients discharged.
{"verdict": "SUPPORT", "evidence": ["The median communicable period, defined as the interval from the first day of positive nucleic acid tests to the first day of continuous negative tests, was 9.5 days (up to 21 days among the 24 asymptomatic cases).", "Through epidemiological investigation, we observed a typical asymptomatic transmission to the cohabiting family members, which even caused severe COVID-19 pneumonia."]}