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Table 1 Characteristics of the included studies

From: Prevalence and proportion of Plasmodium spp. triple mixed infections compared with double mixed infections: a systematic review and meta-analysis

No.

Author, year

Study area

(years of the survey)

Participants

Age range

Age groups (n)

Blood storage for PCR

DNA extraction

Investigated gene

PCR method

Malaria positive by PCR

Mixed infection (dual infection)

Mixed infection (Triple infection)

1.

Asua et al. [2]

Uganda

Malaria positive (499)

6 months to 10 years

 

Dried blood spots

Chelex extraction kits

18S rRNA

Nested PCR

474

Pf/Pm (19)

Pf/Po (14)

Pf/Pv (3)

Pm/Pv (1)

Total = 37

Pf/Pm/Po (1)

2.

Barber et al. [3]

Malaysia (2009–2011)

Malaria positive (653)

P. knowlesi (IQR 20–50 years),

P. falciparum (IQR 9–31 years),

P. vivax

(19 years, IQR 7–32 years)

Triple infection: < 5 (1), 10–14 (1), 30–34 (1), 80–84 (1)

Dual infection: < 5 (1), 5–9 (2), 10–14 (5), 15–19 (3), 20–24 (2), 25–29 (2), 30–34 (4), 35–39 (3), 40–44 (5), 45–49 (2), 50–54 (2), 70–74 (2), 75–79 (1)

NA

NA

18S rRNA

Nested PCR

445

Pv/Pk (36)

Pf/Pk (6)

Pm/Pk (1)

Pf/Pm (1)

Total = 44

Pf/Pv/Pk (2)

Pv/Pm/Pk (2)

3.

Calderaro et al. [4]

Italy (2000–2007)

Febrile patients (701)

NA

 

EDTA blood

High Pure Template Preparation kit (Roche

Diagnostics, Mannheim, Germany)

18S rRNA

Nested PCR

159

Pf/Po (3)

Pf/Pm (1)

Total = 4

Pf/Pm/Po (2)

4.

Camargo-Ayala et al. [5]

Colombia (2012–2015)

Febrile patients (671)

< 5, 5–18, 18–60, and > 60 years

Triple infection: < 5 (4), 5–18 (2), 18–60 (6), > 60 (2)

Dual infection: < 5 (16), 5–18 (56), 18–60 (139), > 60 (15)

EDTA blood

Pure Link Genomic DNA mini kit (Invitrogen)

18S rRNA

Nested PCR

531

Pv/Pm (190)

Pf/Pv (25)

Pf/Pm (10)

Total = 225

Pf/Pm/Pv (14)

5.

Dhangadamajhi et al. [6]

India (2008)

Febrile and asymptomatic (242)

0–5 years, 6–15, and > 15 years

Triple infection: 0–5 (1), 6–15 (2), > 15 (2)

Dual infection: 0–5 (7), 6–15 (32), > 15 (39)

EDTA blood

Phenol–Chloroform extraction

18S rRNA

Nested PCR

197

Pf/Pv (15)

Pf/Pm (54)

Pv/Pm (10)

Total = 79

Pf/Pm/Pv (5)

6.

Dormond et al. [40]

Switzerland (2004–2008)

Malaria positive (89)

>16 years

 

EDTA blood

MagNA Pure LC DNA isolation kit (Roche, Basel, Switzerland)

18S rRNA

Nested PCR

89

Pf/Po (3)

Pf/Pm (2)

Total = 5

Pf/Pm/Po (1)

7.

Fuehrer et al. [41]

Bangladesh:

Chittagong Hill Tracts (2007–2008)

Malaria Research Initiative

Bandarban field site (2008–2009)

Febrile patients (379)

Any age

 

Dried blood spots

Modified Chelex-based technique, the InstaGene Whole Blood

Kit (Bio-Rad Laboratories, Hercules, CA)

18S rRNA

Nested PCR

189

Pf/Pv (21)

Pf/Pm (2)

Total = 23

Pf/Pm/Pv (2)

8.

Gabrielli et al. [42]

Congo (2014)

Residents

(306)

1 week to < 5 years

 

Dried blood spots

The commercial

kit Dried Blood spot DNA isolation Kit (Norgen Biotek

Corp, Ontario, Canada)

18S rRNA

Nested PCR

164

Pf/Pm (13)

Pf/Po (2)

Pf/Pv (1)

Total = 16

Pf/Pm/Pv (1)

9.

Hopkins et al. [22]

Uganda (2010–2011)

Residents (272)

5–81 years: 5–10, 11–20, and ≥ 21 years

 

EDTA blood

Phenol–Chloroform extraction

18S rRNA

Nested PCR and qPCR

199

Pf/Pm (38)

Pf/Po (8)

Total = 46

Pf/Pm/Po (10)

10.

Jiang et al. [43]

Myanmar (2008)

Malaria positive (146)

NA

 

Dried blood spots

Chelex extraction kits

18S rRNA

Nested PCR

146

Pf/Pk (13)

Pv/Pk (13)

Pf/Pv (10)

Total = 36

Pf/Pv/Pk (2)

11.

Kasehagen et al. [11]

Papua New Guinea (2001–2003)

Residents (16,209)

< 2, 2.0–3.9, 4.0–6.9, 7.0–9.9, 10.0–19.9, 20.0–39.9, and ≥ 40 years

 

EDTA blood

QIAamp 96 DNA Blood Kit (QIAGEN, Valencia, CA)

18S rRNA

LDR-FMA

658

Pf/Pv (72)

Pf/Pm (32)

Pf/Po (13)

Pv/Pm (17)

Pv/Po (9)

Pm/Po (4)

Total = 147

Pf/Pm/Pv (28)

Pf/Pv/Po (5)

Pf/Pm/Po (4)

Pv/Pm/Po (4)

Pf/Pv/Pm/Po (11)

12.

Krishna et al. [18]

India (2015)

Doubtful microscopic (355)

≤ 1, > 1–4, >4–8, > 8–14, and > 14 years

 

Dried blood spots

FavorPrep Genomic DNA Mini Kit (Favorgen Biotech Corp., Taiwan).

18S rRNA

Nested PCR

353

Pf/Pv (59)

Pf/Pm (3)

Total = 62

Pf/Pm/Pv (5)

Pf/Pv/Po (1)

Pf/Pv/Pm/Po (1)

13.

Lorenzetti et al. [44]

Brazil (2003–2005)

Malaria positive (115)

18–52 years

 

EDTA blood

Phenol–Chloroform extraction

18S rRNA

Nested PCR

115

Pf/Pm (2)

Pf/Pv (28)

Total = 30

Pf/Pm/Pv (1)

14.

Marques et al. [45]

Mozambique (2001–2002)

Residents (308)

1–82 years

 

EDTA blood

Phenol–Chloroform extraction

18S rRNA

Nested PCR

115

Pf/Pm (70)

Pf/Po (10)

Total = 80

Pf/Pm/Po (9)

15.

May et al. [48]

Nigeria (1996–1997)

Residents (593)

Children in Abanla (1–11 years), Children in Ibadan (3–8 years), Children in health centres in Ibadan (0.8–11 years), Healthy adults (15–56 years)

 

EDTA blood

DNA-Easy Kit (Invitrogen, St. Louis, MO)

18S rRNA

Nested PCR

165

Pf/Pm (41)

Pf/Po (12)

Total = 53

Pf/Pm/Po (27)

16.

Mehlotra et al. [13]

Papua New Guinea (1998–1999)

Residents (1848)

All groups < 1–85 years: 2–4, 5–9, ≥ 10 years

Triple infection: 2–4 (2), 5–9 (8), ≥ 10 (24)

Dual infection: 2–4 (14), 5–9 (51), ≥ 10 (115)

EDTA blood

QIAamp 96 spin blood kits

(QIAGEN, Valencia, CA)

18S rRNA

Nested PCR

541

Pf/Pv (116)

Pf/Pm (27)

Pf/Po (11)

Pv/Pm (21)

Pv/Po (4)

Pm/Po (3)

Total = 182

Pf/Pm/Pv (23)

Pf/Pv/Po (9)

Pf/Pm/Po (1)

Pf/Pv/Pm/Po (3)

17.

Mehlotra et al. [12]

Papua New Guinea (1996)

Malaria positive (173)

5–10 and > 11 years

Triple infection: 5–10 (1), > 11 (0)

Dual infection: 5–10 (6), > 11 (9)

EDTA blood

QIAamp 96 or individual spin blood

kits (QIAGEN, Valencia, CA)

18S rRNA

Nested PCR

163

Pf/Pv (40)

Pf/Pm (16)

Pf/Po (4)

Pv/Pm (3)

Total = 63

Pf/Pm/Pv (27)

Pf/Pv/Po (8)

Pf/Pm/Po (5)

Pv/Pm/Po (1)

Pf/Pv/Pm/Po (9)

18.

Mueller et al. [14]

Papua New Guinea (2005)

Residents (2527)

< 10 and ≥ 20 years

 

EDTA blood

QIAmp 96 DNA Blood kits (Qiagen, CA)

18S rRNA

A semi-quantitative post-PCR, ligase detection reaction/fluorescent microsphere assay (LDR-FMA)

1844

Pf/Pv (363)

Pf/Pm (136)

Pf/Po (27)

Pv/Pm (26)

Pv/Po (7)

Pm/Po (1)

Total = 560

Pf/Pm/Pv (99)

Pf/Pv/Po (33)

Pf/Pm/Po (8)

Pv/Pm/Po (6)

Pf/Pv/Pm/Po (17)

19.

Nino et al. [46]

Colombia (2015–2016)

Febrile patients (1392)

NA

 

EDTA blood

Pure Link Genomic DNA mini kit (Invitrogen)

18S rRNA

Nested PCR

596

Pf/Pv (111)

Pv/Pm (340)

Pf/Pm (29)

Total = 480

Pf/Pm/Pv (52)

20.

Pati et al. [19]

India

Febrile patients (1589)

Severe malaria (15–65 years)

 

Dried blood spots

Chelex extraction kits

18S rRNA

Nested PCR

110

Pf/Pv (11)

Pf/Pm (4)

Pv/Pm (3)

Total = 18

Pf/Pm/Pv (5)

21.

Perandin et al. [20]

Italy

Febrile patients (122)

NA

 

EDTA blood

The High Pure PCR template preparation kit (Roche, Indianapolis,

Ind.)

18S rRNA

Nested PCR

62

Pf/Po (1)

Pf/Pm/Po (1)

22.

Peruzzi et al. [21]

Italy (2005–2006)

Febrile patients (139)

2–49 years

Triple infection: 19 years

EDTA blood

High Pure PCR Template

Preparation Kit” (Roche)

18S rRNA

Nested PCR

36

None

Pf/Pm/Po (1)

23.

Pongvongsa et al. [28]

Laos-Vietnam border (2010)

Residents (3059)

Sample for PCR (135)

P. knowlesi (2–15 years)

Triple infection (Pf/Pv/Pk): mean 6.43 years (7)

Dual infection (Pk/Pv): mean 7.4 years (5)

Dried blood spots

QIAamp DNA micro kit

(QIAGEN, Tokyo, Japan)

18S rRNA

Nested PCR

90

Pf/Pv (15)

Pf/Pm (2

Pv/Pk (5)

Total = 22

Pf/Pm/Pv (1)

Pf/Pv/Pk (7)

24.

Putaporntip et al. [25]

Thailand (2006–2007)

Febrile patients (1874)

1–81 years

 

Dried blood spots

Qiagen DNA Mini Kit

18S rRNA

Nested PCR

1751

Pf/Pv (200)

Pf/Pm (6)

Pf/Po (2)

Pf/Pk (5)

Pv/Pm (8)

Pv/Po (4)

Pv/Pk (4)

Pm/Po (1)

Total = 230

Pf/Pm/Pv (4)

Pf/Pv/Po (7)

Pf/Pv/Pm/Po (1)

25.

Rubio et al. [38]

Spain (1997–1998)

Febrile patients (168)

NA

 

EDTA blood

Modified Chelex-based technique, the InstaGene Whole Blood

Kit (Bio-Rad Laboratories, Hercules, CA)

18S rRNA

Nested PCR

89

Pf/Pm (4)

Pf/Po (1)

Pf/Pv (3)

Total = 8

Pf/Pm/Pv (1)

26.

Rubio et al. [39]

Equatorial Guinea (1996)

Febrile patients (159)

< 6 years

 

Dried blood spots

5% Chelext-100 Resin (Bio-Rad Laboratories,

Hercules, CA)

18S rRNA

Nested PCR

126

Pf/Pm (36)

Pf/Po (3)

Pf/Pv (2)

Total = 41

Pf/Pv/Po (3)

27.

Sitali et al. [29]

Zambia (2012)

Residents (873)

< 6 years

 

Dried blood spots

Chelex extraction kits

18S rRNA

Nested PCR

474

Pf/Pm (31)

Pf/Po (10)

Pf/Pv (1)

Total = 42

Pf/Pm/Po (6)

Pf/Pm/Pv (1)

28.

Sluydts et al. [15]

Cambodia (2012)

Residents (5793)

2–5, 5–14, 15–39, and ≥ 40 years

 

Dried blood spots

Instagene® Matrix resin (Bio-Rad, Singapore)

18S rRNA

Two-step Real-time PCR

368

Pf/Pv (56)

Pf/Pm (5)

Pf/Po (1)

Pv/Pm (3)

Pv/Po (11)

Total = 76

Pf/Pm/Pv (4)

Pf/Pv/Po (1)

Pf/Pv/Pm/Po (1)

29.

Steenkeste et al. [16]

Cambodia (2001)

Residents (337)

NA

 

Dried blood spots

the Instagene resin (Bio-Rad,

USA)

18S rRNA

Nested PCR

140

Pf/Pv (52)

Pf/Pm (15)

Pf/Po (4)

Total = 71

Pf/Pv/Po (7)

Pf/Pm/Pv (24)

Pf/Pv/Pm/Po (8)

30.

Steenkeste et al. [17]

Cambodia (2001)

Residents (134)

< 1– > 60 years: < 1, 1, 2, 3, 4, 5–9, 10–14, 15–19, 20–39, 40–60, and > 60 years

 

Dried blood spots

Instagene resin (Bio-Rad, Germany) a

18S rRNA

Nested PCR

102

Pf/Pm (4)

Pf/Po (2)

Pf/Pv (18)

Pv/Pm (3)

Total = 27

Pf/Pm/Pv (7)

Pf/Pv/Po (3)

Pf/Pv/Pm/Po (3)

31.

Subissi et al. [23]

Uganda (2010)

Residents (509)

1–5, 6–10, and > 20 years

Triple infection: 1–5 (5), 6–10 (5), > 20 (0)

Dual infection: 1–5 (27), 6–10 (24), > 20 (2)

Dried blood spots

QIAamp mini kit (QIAGEN, Venlo, The Netherlands)

18S rRNA

Nested PCR

299

Pf/Pm (39)

Pf/Po (14)

Total = 53

Pf//Pm/Po (10)

32.

Toma et al. [27]

Laos (1997)

Residents (336)

< 11– > 50 years: 2–68 years in Phavang and 0–75 years in Sisomsouen

 

EDTA blood

GFX Genomic Blood DNA Purification

Kit (Pharmacia Biotech).

18S rRNA

Nested PCR

117

Pf/Pv (19)

Pf/Pm (2)

Pv/Pm (2)

Pv/Po (1)

Total = 24

Pf/Pm/Pv (1)

Pf/Pv/Po (1)

Pf/Pv/Pm/Po (1)

33.

Woldearegai et al. [47]

Gabon (2016)

Residents (834)

1–96 years: 1–5, 6–10, 11–15, 16–20, 21–25, 26–30, 31–40, 41–50, 51–60, 61–70, 71–80, and 81–96 years

 

EDTA blood

QIAsymphony DSP DNA kit

18S rRNA

Nested PCR

618

Pf/Pm (123)

Pf/Po (43)

Pm/Po (1)

Total = 167

Pf//Pm/Po (51)

34.

Zhou et al. [24]

Thailand (1995–1996)

Residents (548)

NA

 

Thick smear

30% Chelex-100

18S rRNA

Nested PCR

114

Pf/Pv (10)

Pf/Pm (6)

Pv/Pm (19)

Pv/Po (1)

Total = 36

Pf/Pm/Pv (49)

Pf/Pv/Po (2)

Pv/Pm/Po (1)

Pf/Pv/Pm/Po (7)

35.

Zhou et al. [26]

China (2008–2012)

Febrile patients (562)

NA

 

Dried blood spots

QIAamp

DNA Mini Kit (QIAGEN China (Shanghai)

18S rRNA

Nested PCR

384

Pf/Pv (67)

Pv/Po (2)

Pf/Pk (2)

Pf/Pm (2)

Po/Pm (1)

Total = 74

Pf/Pv/Po (3)

Pf/Pm/Pv (1)

Pv/Pm/Po (1)

Pf/Pv/Pm/Po (1)

          

Total = 12,023

2 species = 3059

Pf/Pv = 1318

Pf/Po = 188

Pf/Pm = 775

Pf/Pk = 26

Pv/Pm = 645

Pv/Po = 39

Pv/Pk = 58

Pm/Po = 10

Pm/Pk = 1

3 species = 601

Pf/Pm/Pv = 355

Pf/Pv/Po = 83

Pf/Pm/Po = 137

Pf/Pv/Pk = 11

Pv/Pm/Po = 13

Pv/Pm/Pk = 2

4 species = 53

  1. Pf refers to P. falciparum
  2. Pv refers to P. vivax
  3. Po refers to P. ovale
  4. Pm refers to P. malariae
  5. Pk refers to P. knowlesi
  6. NA Not Assessed