Old school D3 from simpler times

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Malaria_2000

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
.country {
  fill: #ccc;
  stroke: #777;
}
.malaria {
  fill-opacity: .5;
  stroke: #f00;
  fill: #f00;
  stroke-width: .5px;
}
</style>

<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/topojson.v0.min.js"></script>

<script>
var malaria = [{'number': 'Senegal', 'cases': 44959, 'longitude': -14.452362,'latitude': 14.497401},
{'number': 'Saudi Arabia', 'cases': 4736, 'longitude': 45.079162,'latitude': 23.885942},
{'number': 'Madagascar', 'cases': 6946, 'longitude': 46.869107,'latitude': -18.766947},
{'number': 'Central Africa', 'cases': 33411, 'longitude': 19.568710,'latitude': 2.318462}, {'number': 'Burundi', 'cases': 308095, 'longitude': 29.918886, 'latitude': -3.373056}, {'number': 'Botswana', 'cases': 10510, 'longitude': 24.684866, 'latitude': -22.328474}, {'number': 'Bhutan', 'cases': 5935, 'longitude': 90.433601, 'latitude': 27.514162}];
  
var radius = d3.scale.sqrt()
    .domain([0, 40000])
    .range([0, 4.56]);
  
var width = 960,
    height = 500;
  
var projection = d3.geo.orthographic()
    .scale(293)
    .translate([width / 2, height / 2])
    .clipAngle(121)
    .rotate([.5,0]);
  
var path = d3.geo.path()
.projection(projection);
  
var svg = d3.select("body")
		.append("svg")
    .attr("width", width)
    .attr("height", height);
d3.json("https://cdn.rawgit.com/mbostock/4090846/raw/8a7f176072d508218e120773943b595c998991be/world-50m.json", function(error, data) {
  svg.append("path")
      .attr("class", "country")
      .datum(topojson.object(data, data.objects.countries))
      .attr("d", path);
  svg.selectAll(".malaria")
        .data(malaria)
        .enter()
        .append("circle")
        .attr("class","malaria")
        .attr("r", function(d){return radius(d.cases);})  
        .attr("cx", function(d){ return projection([d.longitude, d.latitude])[0];})  
        .attr("cy", function(d){ return projection([d.longitude, d.latitude])[1];});
});
</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

Modified http://d3js.org/topojson.v0.min.js to a secure url

https://d3js.org/d3.v3.min.js

https://d3js.org/topojson.v0.min.js