Table 1 Protection of C57BL/6 mice immunized in a 3-shot regimen with the indicated strains against challenge with wildtype P. berghei ANKA sporozoites or blood stages).

From: Protective efficacy and safety of liver stage attenuated malaria parasites

Exp.

Attenuated parasite line (P. berghei ANKA)

1st shot

2nd and 3rd shots * (day of shots)

Challenge dose # (day of challenge)

Protected/challenged animals (pre-patency) +

Challenge 1

Challenge 2

1

LISP2(–)

10.000

10.000 (d14, d28)

1.000 (d42)

10.000 (d116)

C1: 3/4 (d 6), C2: 1/1

    

5.000 bs (d116)

C2: 0/2 (d 4.5)

   

1.000

 

0/4 (d 3)

2

LISP2 (–)

50.000

20.000 (d14, d28)

10.000 (d42)

10.000 (d102)

C1 : 4/4, C2 : 2/2

    

10.000 bs(d102)

C2 : 0/2

uis3(–)

50.000

20.000 (d14, d28)

10.000 (d42)

10.000 (d102)

C1: 6/6 ** , C2: 6/6

LISP2(–)/uis3(–)

50.000

20.000 (d14, d28)

10.000 (d42)

10.000 (d102)

C1: 8/8, C2: 8/8

   

10.000

 

0/8 (d 3.1)

  1. Groups of C57BL/6 age-matched mice were used for different immunizations. Blood stages were included to probe stage specific protection.
  2. *Data are presented as numbers of sporozoites for first, second and third shot; days of shots are indicated in parentheses.
  3. #mice are challenged with PbANKA wild type sporozoites or blood stages (bs); days of challenge after prime are indicated in parentheses.
  4. +C1: challenge 1, C2: challenge 2; day of blood stage emergence (pre-patency) is indicated in parentheses.
  5. **Two mice became positive after priming; thus challenge was only performed with 6 mice.