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Hello and welcome to this podcast

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from the BBC World Service. Please

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That's bluenile.com. Hey,

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I'm Hey, I'm Ryan Reynolds.

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Recently, I asked Mint Mobile's legal team

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yes. And then when I asked if

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Unlimited slows. Oh,

1:22

there we go. There's another one

1:24

there. Oh, gosh, that's tiny. Oh,

1:26

yeah, it's landed. Oh,

1:28

it's gone again. Oh, no, it's here. It

1:30

might land again. I'm in a caravan park

1:32

near the city of Rexham in the UK

1:34

with crowd science listener Jenny. There's

1:37

another one there. There we are. On a

1:39

leaf? Yeah. And we're looking for

1:41

something. Oh, this one's about

1:43

to land again. Oh, no. What's

1:46

that there? Look, oh, I

1:49

think that might be a moth. That's a moth. We're

1:52

crouched down searching through nettles and

1:54

brambles, looking for and

1:56

counting a particular type of insect.

1:58

Oh, a fly. They

22:01

spread diseases. So some

22:03

human pathogens of

22:06

all kinds have

22:09

found a way to get from

22:11

vertebrae, host to vertebrae, host from

22:13

mammal to mammal, including from human

22:15

to human, by

22:17

climbing into bloodsucking insects

22:20

and ticks and mites. And

22:22

those insects and ticks and

22:25

mites are called vectors because they carry the

22:28

virus or the bacteria or

22:31

the parasite from body to body.

22:33

This is Jo Lines, professor of

22:35

malaria control and vector biology at

22:37

the London School of Hygiene and

22:39

Tropical Medicine. Jo's research

22:41

focuses on malaria, which is spread

22:43

from person to person via a

22:45

particular type of fly, the

22:47

mosquito. Malaria kills

22:49

over half a million people every

22:52

year, most of them

22:54

children and mainly in Africa. We

22:56

visited Malawi earlier this year to record

22:58

an episode of Crowd Science called Why

23:01

Are People Still Dying of Malaria? Another

23:03

one you can find in our podcast archive.

23:07

As well as malaria, mosquitoes carry

23:09

other diseases. One particular

23:11

type of mosquito called Aedes aegypti

23:14

is a major vector of dengue and chicken gunia. Aedes

23:17

aegypti went to the Caribbean,

23:19

got taken to the Caribbean,

23:22

probably as part of the slave trade. It's

23:25

home in Africa, but

23:27

it has spread not just to the

23:29

Caribbean and the New World but throughout

23:32

Asia as well. So it's now cosmetropical

23:36

as a species. The

23:38

most common disease that it transmits

23:41

is dengue, but it

23:43

is also the main vector of

23:45

chicken gunia virus and Zika virus.

23:48

I think in both of those cases,

23:50

chicken gunia and Zika, before

23:53

they were very common, and that's only

23:55

happened in the last decade or so,

23:57

we didn't really record the disease.