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Persistent infections occur because the body is unable to clear the organism after the initial infection. Persistent infections are characterized by the continual presence of the infectious organism, often as latent infection with occasional recurrent relapses of active infection. There are some viruses that can maintain a persistent infection by infecting different cells of the body. Some viruses once acquired never leave the body. A typical example is the herpes virus, which tends to hide in nerves and become reactivated when specific circumstances arise.
How can some viruses cure a persistent infection?
A: unanswerable

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The Netherlands regained independence from France in 1813. In the Anglo-Dutch Treaty of 1814 the names "United Provinces of the Netherlands" and "United Netherlands" were used. In 1815 it was rejoined with the Austrian Netherlands, Luxembourg and Liège (the "Southern provinces") to become the Kingdom of the Netherlands, informally known as the Kingdom of the United Netherlands, to create a strong buffer state north of France. After Belgium and Luxembourg became independent, the state became unequivocally known as the Kingdom of the Netherlands, as it remains today.
The Kingdom of the Netherlands was formed by which countries?
A: Austrian Netherlands, Luxembourg and Liège

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Philadelphia's an annualized unemployment rate was 7.8% in 2014, down from 10.0%the previous year. This is higher than the national average of 6.2%. Similarly, the rate of new jobs added to the city's economy lagged behind the national job growth. In 2014, about 8,800 jobs were added to the city's economy. Sectors with the largest number of jobs added were in education and health services, leisure and hospitality, and professional and business services. Declines were seen in the city's manufacturing and government sectors.
Unemployment rate in 2014?
A: 7.8%

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Out of former Soviet Union republics Uzbekistan continued and expanded the program of child labour on industrial scale to increase profits on the main source of Islam Karimov's income, cotton harvesting. In September, when school normally starts, the classes are suspended and children are sent to cotton fields for work, where they are assigned daily quotas of 20 to 60 kg of raw cotton they have to collect. This process is repeated in spring, when collected cotton needs to be hoed and weeded. In 2006 it is estimated that 2.7 million children were forced to work this way.
Did they have daily quotas for cotton?
A:
daily quotas of 20 to 60 kg of raw cotton