Lab workers infect the mice artificially with the virus, keeping precise records of how much virus and what type of virus is used. But natural transmission of dengue by mosquitoes involves certain proteins the insects inject into the skin, something that Rico-Hesse says is missing when mice are artificially infected in the lab.
If you are just, you know, injecting it in with a syringe, you are missing out on all those salivary gland factors and all the things that happen during a natural infection that might either speed up the infection rate or decrease the infection rate. And we also need to know how many mosquitoes it takes to infect a humanized mouse, she said.
Rico-Hesse and her colleagues are breeding mosquitoes in the laboratory to test various strains of the dengue virus transmitted to the mice by mosquitoes.
Although effective vaccines or antiviral drugs for dengue may still be a long way off, researchers here say they are making important steps that they hope will one day minimize the suffering and death caused by the illness
1.Which statement is correct according to Paragraph 1
A.Dengue fever can be eradicated by mosquitoes.
B.Strong effect of certain medication can cure dengue fever.
C.By killing all the mosquitoes in the world, we can prevent dengue fever.
D.Scientists have invented a vaccine that can prevent dengue fever
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