Ascaris lumbricoides and Ascariasis: Estimating Numbers Infected and Burden of Disease - Ascaris: The Neglected Parasite - page 332

(A)

1.35

60

Prevalence of Ascaris

1.30

50

Effective reproductive
number

1.25

40

1.20

30

1.15

20

1.10

10

1.05

0 1.00

1969 1974 1979 1984 1989 1994 1999 2004

Year

(B)

100 16

All helminths
Ascaris
GNP income

90

14

80

12

70

10

60

50 8

40

6

30

4

20

2

10

0

0

1969 1974 1979 1984 1989 1994 1999 2004

Year

FIGURE 13.2 Changing patterns of (A) the prevalence and transmission (as estimated
by the effective reproductive number, R) of Ascaris lumbricoides and (B) other intestinal
nematodes and nation gross domestic product (GDP) in South Korea, 1969 2004. Data

e

adapted from ref. 25

Prevention Act. This law stipulated that all school children should be
screened by fecal examination periodically and all infected children
treated with anthelmintics. 25 Having instituted these control activities, the
prevalence and transmission of A. lumbricoides began to decrease rapidly
( Figure 13.2 A). The implementation of large-scale control coincided with