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DNA sequences of primers used in this study and an additional acknowledgement (Brian Taylor, 27 August 2014)

We would like to add the following supplementary information for this... read full comment

Comment on: Taylor et al. Malaria Journal, 13:179

Erratum (Sergio Bydlowski, 05 July 2014)

We have unfortunately found some mistakes in our recently published... read full comment

Comment on: Maselli et al. Malaria Journal, 13:224

Useful conclusion?  (Amrish Baidjoe, 26 May 2014)

I read your paper with great interest. Sensitivity and specificity are interesting subjects when it comes to the detection of low density infections. I am although troubled by your conclusion. In your conclusion you mention that based on the results DBS samples yield a lower amount of positives when compared to whole blood. This seems a reasonable outcome, although we found mixed results. Obviously this depends on stability of PCR targets and such. My biggest issue is that you used different ways of storing your samples. If I read it correctly the whole blood samples are stored at -20 up to the time of extraction (2.5yrs) where the DBS samples are stored at RT for 6-9 months and then stored at -20 for the remainder of time. The large variation of positives could be derived on the... read full comment

Comment on: Strøm et al. Malaria Journal, 13:137

Note regarding error in data analysis (Sarah Reece, 26 May 2014)

Some of the data in the paper were inadvertently mislabelled. Specifically, for infections initiated with trophozoite stage parasites, the schedule “matched” treatment group was incorrectly analysed as “mismatched” and vice-... read full comment

Comment on: O’Donnell et al. Malaria Journal, 12:372

AsOX3534 (Osvaldo Marinotti, 26 May 2014)

An incorrect plasmid ID (AsOX3534) was inadvertently inserted in the legend of Figure 2. The correct plasmid ID should read AsOX3545. This correction does not in any way change the conclusions of our work. read full comment

Comment on: Marinotti et al. Malaria Journal, 12:142

Error in citing and quoting a reference (Preeti Shanbag, 26 May 2014)

I read with interest the article on 'hypokalemic paralysis in an adult with P vivax malaria' and thank the authors for reporting such an unusual presentation.However I would like to point out certain errors in citation and quotation of a reference made by the authors.
Reference no. 4 has been wrongly cited. The spelling of the first author has been misspelt as Dworak instead as Dvorak.
The reference itself has been wrongly cited as"Invasion of the electrolytes by the malarial parasite" instead of "Invasion of erythrocytes by malarial merozoites."
Moreover the article by Dvorak et al deals with an electro-optical system which was developed by them to record microscope images with high resolution at low light intensities and not with electrolyte abnormalities in malaria. read full comment

Comment on: Sinha et al. Malaria Journal, 12:111

Error in Table 1 (Michael Marks, 26 May 2014)

An error in Table 1 of our recently published manuscript has been bought to our attention. The 11th Study listed in Table 1 (Santos et al) is listed as having been conducted in Spain. This is a mistake and should say Portugal. We apologise for this mistake in the manuscript. Dr Michael Marks on behalf of the authors. read full comment

Comment on: Marks et al. Malaria Journal, 13:79

HRP-2 deletion makes diagnostics further imperfect for low malaria transmission context in the Amazon Region (Jaime Chang, 01 April 2014)

Following on the 2010 report by Gamboa et al. on a large proportion of Plasmodium falciparum isolates from the Peruvian Amazon lacking HRP-2 and HRP-3 (DOI: 10.1371/journal.pone.0008091), colleagues from CDC and Amazon countries have assessed the frequency of deletion of HRP-2 and HRP-3 genes among P. falciparum strains circulating in Bolivia, Brazil, Colombia, Guyana, Peru, and Suriname. The deletions were found in parasites from all countries but Guyana. In the other countries HRP-2 deletion frequencies ranged between 4% and 33%, while HRP-3 deletion frequencies ranged between 3% and 53%. By adding a shortcoming to HRP-2 dependent rapid tests, this further complicates efforts against malaria in a region with decreasing malaria transmission, where most remaining malaria occurs in... read full comment

Comment on: Mosha et al. Malaria Journal, 12:221

Erratum: Error in the given primer concentrations. (Christel Gill Haanshuus, 08 March 2014)

We have unfortunately discover error in the given primer concentrations in our article. The incorrect primer concentrations affect the efficiency of the PCR... read full comment

Comment on: Haanshuus et al. Malaria Journal, 12:26

Vector species incrimination crucial for malaria elimination (Michael Bangs, 13 November 2013)

As regular readers of the Malaria Journal, we would like to point out an obvious weakness of the paper by Herdiana et al. (2013, 12:42) regarding the entomological analysis. Several aspects of the authors¿ conclusions are unacceptable, especially the conclusion that Anopheles dirus and An. minimus are present on Sabang Island (northern Sumatra). Even if true, such a pronouncement is inappropriate without performing definitive confirmation of species identity. Given they failed to do so, the findings should have been properly presented in the context of this shortcoming and what implications it might have for eliminating malaria from the island. Neither the subject paper nor cited reference (Hudson et al. 1985) indicates the primary malaria vector(s) on Sabang Island, other than to state... read full comment

Comment on: Herdiana et al. Malaria Journal, 12:42

Authors Note (Penelope Lynch, 19 March 2013)

A number of problems introduced during the copy-editing process for this paper remain unresolved in the currently published versions. We still hope to see these resolved by Biomed Central, but meanwhile note the following in an attempt to minimise confusion regarding the symbols representing model variables and parameters.

The symbol used to represent lifetime egg production should be lower case phi, as shown in on-line HTML text and tables, not the symbol shown in the pdf, which should be used only to represent the period of time spent finding an oviposition site and laying. In addition, although a number of different typefaces have been used, please assume that a given case of a given Arabic letter represents the same item in all tables and equations. read full comment

Comment on: Lynch et al. Malaria Journal, 11:383

Figure 5 Legend (John Renschler, 19 March 2013)

I think the colors described in the Figure 5 legend are backwards.

As written the red line represents halved drug pressure and the blue line is the baseline waiting time. If that were true then the panels show that Time to Emergence is shorter for the halved drug pressure than for baseline. read full comment

Comment on: Smith et al. Malaria Journal, 9:217

A pointer to previous work on this topic. (Ian Hastings, 26 November 2012)

Readers should be aware that we published a very similar PK/PD methodology and analysis of antimalarial drugs last year in AAC that is not cited or discussed in this manuscript... read full comment

Comment on: Zaloumis et al. Malaria Journal, 11:303

Pyrosequencing primers (Dylan Pillai, 26 November 2012)

We thank Woodrow et al for their important commentary [1]. Analysis of the pyrosequencing primers used for the detection of the two mutations in question (pfatp6 A623E and S769N), in this and a previous publication [2], confirmed the following. The Genbank ID (EF564342), which has also been reported by others [3], was used in the design of the pyrosequencing primers. However, this sequence is missing 14 amino acids at the N-terminus. As such, though the primers were designed to target the correct amino acid positions, they were based on the incomplete coding sequence and therefore did not identify the mutations in question. Hence, further Sanger-based sequencing will be required to confirm the presence or absence of mutations in PfATP6 sequences of these clinical isolates in relation to... read full comment

Comment on: Pillai et al. Malaria Journal, 11:131

Confusing nomenclature (Konrad Koehler, 16 July 2012)

I applaud the authors for exploring this very interesting and worthwhile approach to developing new... read full comment

Comment on: Willcox et al. Malaria Journal, 10:S8

The address of the interim report of this study (Ahmad Raeisi, 14 June 2012)

The authors wish to point out that an interim report of this study, including the data from the Hormozgan site, had been published a few weeks before this paper in the Iranian Journal of Parasitology:

Absence of asymptomatic malaria infection in endemic area of Bashagard district, Hormozgan Province in Iran; Turki H, Zoghi S, Mehrizi AA, Zakeri S, 7(1), 32-35 read full comment

Comment on: Zoghi et al. Malaria Journal, 11:126

Re: Ishag Adam (Agnieszka Kempinska-Podhorodecka, 14 June 2012)

Thank you for your interest in our paper. We would like to explain that our research was carried out during a scientific expedition organized by the Museum of Archaeology in Gda¿sk (MAG) (Poland). Since 1996, MAG has had a long-term concession for surface and excavation works in the region of the 4th Cataract on the right bank of the Nile, granted by the National Corporation for Antiquities and Museums (NCAM) in Khartoum. The expedition was led by the director of MAG, Henryk Paner. Our research is a part of a large-scale archaeological inventorisation of the middle Nile region, initiated by NCAM because of the intended dam erection in the area of Umm Duwemi village and Merowe Island. The aim of the campaign was to rescue cultural heritage and protect monuments in the areas to be flooded... read full comment

Comment on: Kempińska-Podhorodecka et al. Malaria Journal, 11:115

An alternative cellulose powder to CF11 (Bruce Russell, 14 June 2012)

Malaria groups at A*STAR and NUS (Singapore), Eijkman Institute for Molecular Biology(Indonesia) and SMRU (Thailand) have effectively substituted the use of CF11 with Sigma medium fiber Powder (cat # c6288) since September 2011. Preparation of the filter columns using the Sigma cellulose powder are as per Sriprawat et al 2009 (http://www.malariajournal.com/content/8/1/115) . read full comment

Comment on: Venkatesan et al. Malaria Journal, 11:41

GMP artesunate (Arjen M Dondorp, 11 May 2012)

I enjoyed reading this interesting study. I just wanted to comment on the statement made by the authors regarding the Guilin artesunate product that WHO prequalification "is not the same as GMP certification". It is a prerequisite that all WHO prequalified products are manufactured to GMP and verified as such by inspectors from WHO or a stringent authority. read full comment

Comment on: Kreeftmeijer-Vegter et al. Malaria Journal, 11:102

Re Analysis for genotyping Duffy blood group in inhabitants of Sudan, the Fourth Cataract of the Nile (Ishag Adam, 11 May 2012)

I read this article with great interest and I have to congratulate the authors.
However, It is not obvious is the methods how they approached the patients and how the patients were consented. It is var difficult to convey such study in Sudan with Polish scientists without one of the local researchers. Importantly in the ethics section authors mentioned that they received ethical clearance from Poland, we do respect this but is it valid to have an ethical clearance from Poland and fostered the study in Sudan?
I hope authors would to be able to clarify these points
Best Regards read full comment

Comment on: Kempińska-Podhorodecka et al. Malaria Journal, 11:115

Update on CF11 availability (Christopher Plowe, 11 May 2012)

Unfortunately, as this paper went to press the manufacturer of CF11 put column production on hold, and subsequently suspended making them indefinitely. While they may resume in the future, we are investigating and evaluating alternative inexpensive means of leukocyte depletion. For updates, please visit the Molecular Module page on the website of the WorldWide Antimalarial Resistance Network www.wwarn.org. read full comment

Comment on: Venkatesan et al. Malaria Journal, 11:41

the title (NAGUMO WALTER-RODNEY, 11 May 2012)

i think the title should have stated what phase of the trial is the study read full comment

Comment on: Adjei et al. Malaria Journal, 7:127

Additional IRS costing data (Michael White, 11 May 2012)

Readers wishing to obtain more up to date data on the costs of indoor residual spray programmes may want to check out the following excellent report from the President's Malaria Initiative:

An economic analysis of the costs of indoor residual spraying in 12 PMI countries, 2008¿2010

Prepared by
Jeffrey Sine, Rajeev Colaco, and Hannah Frawley

http://www.pmi.gov/technical/irs/IRS_economic_analysis.pdf


Michael White read full comment

Comment on: White et al. Malaria Journal, 10:337

Erratum (John Frean, 11 May 2012)

Table 1 legend should read:
Data shown are number of parasites and white blood cells (WC) counted per slide, as well as the white blood cell count (WCC, as leukocytes per µl) used to calculate the parasite density for each slide by manual, digital, and conventional methods. read full comment

Comment on: Frean Malaria Journal, 8:218

Survival rate formula assumes stable age structure (Olivier Johan Tavai Briët, 18 October 2011)

The authors use Davidson's formula (1954) to estimate the survival rate, which assumes that the mosquito population age structure is stable over the period of data collection. Since the data were collected for 10 nights in (only) one month, it is difficult to establish whether the population was approximately stable. If, for instance, the population was growing during the month surveyed, this would lead to underestimation of the survival rate. Even though there is little seasonality of rainfall in the area, the reported low survival rates should be interpreted with caution if there is no evidence that the population was stable.

Reference
Davidson, G. (1954) Estimation of the survival-rate of anopheline mosquitoes in nature. Nature, UK, 174, 792-793. read full comment

Comment on: Bugoro et al. Malaria Journal, 10:287